RULE BOOK DISCLAIMER

The rules and/or regulations set forth herein are designed to provide for the orderly conduct of racing events and to establish minimum acceptable requirements for such events.  These rules shall govern the condition of all events, and by participating in these events, all participants are deemed to have complied with these rules.   NO EXPRESSED OR IMPLIED WARRANTY OF SAFETY SHALL RESULT FROM PUBLICATIONS OF OR COMPLIANCE WITH THESE RULES AND OR REGULATIONS.  They are intended as a guide for the conduct of the sport and are in no way a guarantee against injury or death to a participant, spectator, or official.
The race director shall be empowered to permit reasonable and appropriate deviation from any of the specifications herein or impose any further restrictions that in his/her opinion does not alter the minimum acceptable requirements.  NO EXPRESSED OR IMPLIED WARRANTY OF SAFETY SHALL RESULT FROM SUCH ALTERATION OF SPECIFICATIONS.  Any interpretation or deviation of these rules is left to the discretion of the officials. Their decision is final.
                                          
               


The Management of  Edward F.  McKernan








  
             2018 CRATE SPORTSMAN MODIFIED RULES


                                                               
                                                                Engines
A. The General Motors (GM) / Chevrolet Performance Engine part number 
   #88958602/19258602 and #88869602 is the only engine permitted in all Crate
   Sportsman Modified events.
B. The engine and all components must remain in their original configuration and

   form as purchased and/or delivered from the factory. Any alterations to the
   engine will not be permitted. The Engine must remain as manufactured by
   General Motors with a stock 4”-inch bore. Overbore(s) will not be permitted.
   Sleeve repair may be permitted with written permission from DIRTcar and/or
   World Racing Group Officials.
C. All engines are to remain sealed from the factory. The original factory seals must

   remain unaltered. Tampering, removal, modifications of any type and/or broken
   factory seals will not be permitted. The GM Engine must remain unaltered in any
   way.
D. The GM Crate Engine seals (bolt-type) must remain unaltered. We may require

   verification of all seals on any GM Crate Engine. Tampering with and/or alteration
   of any seals will not be permitted and is subject to immediate penalty and/or
   suspension.
E. Only GM replacement parts of any type will be permitted for any type of

   replacement and/or repair work. Only GM Crate Engine specific valve springs may
   be used for replacement and/or repair, Part Number # 10212811.
F. GM Crate Engine repairs must be authorized by DIRTcar. GM Crate Engine repair

   procedure works as follows:
   a. Contact your track promoter and/or your local track and/or DIRTcar Technical
      Officials.
   b. The Promoter and/or Technical Officials will specify a repair location and
      instruct the driver/owner where to take the engine to get an estimate.
   c. Based on the estimate and the detail of the repair, DIRTcar officials will

      determine if the repairs may be made or if a new engine must be purchased.
   d. If a repair is approved, a specified inspector will inspect the engine and work

      with the engine repair facility throughout the duration of the repair to ensure
      that the engine maintains the GM Specifications.
   e. Upon completion of the repair(s) the engine will be ‘resealed’ before being

      released for competition.
   f. All parts including the gasket repair kit(s) must be stock OEM Chevrolet
      Performance replacement parts. The receipt(s) generated from the Chevrolet
      Performance Dealer and/or parts department must be retained and a copy
      presented to DIRTcar for verification.
  g. Over bores will not be permitted. If a cylinder has scoring and/or needs repair it
      must be communicated to DIRTcar officials before being sleeved to maintain the
      original bore size.
  h. Valve jobs will not be permitted. Valves may be lapped.
   i. If the cylinder head requires resurfacing and/or valve seats, a new cylinder head
      must be purchased. Machine work of any type will not be permitted to the
      cylinder heads.
   j. Bead blasting and/or any polishing and/or any alteration to the intake manifold       and/or cylinder heads will not be permitted.
  k. The distributor advance curve and/or all parts must remain stock as
      manufactured. 
   l. All engine information regarding repairs and/or engine introduction must be
      retained and turned into DIRTcar Officials, to track and manage engine
      database, including the driver, serial number, repair, type of repair and/or what
      type of service was performed to any engine.
  m. If any repair estimates come back to the DIRTcar Officials that meet and/or
      exceed 80% of the actual price of a new engine, a new engine must be
      purchased. The engine that was damaged will no longer be eligible for
      competition.
    
G. Track Officials reserve the right to technically inspect, exchange and/or
   confiscate any GM Crate Engine at any time. Failure to surrender the engine
   and/or submit the engine for inspection equals disqualification from the event
   and/or suspension. 
H. The intended direction of the GM Crate Engine program is to maintain a cost-
   effective, affordable racing program. Rebuilding, balancing, blue printing and/or
   any other alteration made in an attempt to influence the integrity of this program
   will not be permitted. The judgment and determination of any such decision will
   be at the sole discretion of Track Officials.
I. All engines and all components must remain in their original configuration and

   form as purchased and/or delivered from the factory. Any changes will result in
   disqualification from the event. Any alterations to the engine will not be
   permitted.


  
                                            CARBURETOR/AIR CLEANER

A. Only one (1) 650 cfm Holley carburetor, Part Number 4777 or 80777 or Holley HP
   Carburetor Part Number 80541-1 will be permitted.
B. 4777 and 80777 Option:
   a. The carburetor must maintain the stock venture and throttle bore dimensions.
   b. The carburetor must maintain all stock dimensions, including mounting and
      stud location on intake manifold.
   c. The booster height must remain stock OEM from Holley. Cutting, tumbling
      and/or polishing will not be permitted.
   d. Visible modifications will not be permitted.
   e. The maximum height of the carburetor when measured from the bottom of the
      carburetor and/or the throttle plate to the machined horizontal surface of block
      will be 7”-inches in both the front and rear of the block.
   f. The following alterations will be permitted;
          1. Holes drilled in the throttle plate for proper idle.
          2. Drilling, tapping and plugging of unused vacuum ports.
          3. Welding of throttle shaft to linkage arm.
          4. Drilling of idle and/or high-speed air correction jets.
          5. Milling of center carburetor body metering block surface, maximum of
             .015” on each
                 side.
          6. Removal of choke plate and shaft.
          7. The jets may be changed as needed.
   g. Gauge measurements (go/no-go) must be met at all times, regardless of
       carburetor temperature.
C. HP 80541-1 Option:
   a. The carburetor must remain stock retaining all Holley measurements and
      dimensions. The carburetor may be adjusted utilizing only specified Holley
      replacement parts.
   b. Jets, bleeds, needle and seat, emulsion bleeds, power valves, accelerator

      pumps nozzles and accelerator pump cam adjustments will be permitted.
   c. Physical alteration of carburetor components and/or parts and/or any

      alterations, machining and/or reshaping will not be permitted. The use of epoxy
      and/or coatings of any kind will not be permitted.
D. A single unaltered carburetor spacer plate with an unaltered square 
   hole/opening including gasket with a maximum thickness of 1-1/8”-inch will be
   permitted. Tapering, machining and/or any other alteration to the spacer plate
   will not be permitted.
E. Only a single conventional round type air cleaner housing with a bottom 5”
   center hole will be permitted. Ram air, air box and/or heat shield type devices will
   not be permitted. The air cleaner must remain in place when the hood is
   removed.
F. Air cleaners that provide ventilation through the top cover (such as the K & N

   brand) will be permitted.
G. Air induction plastic carburetor insert and/or other devices that direct air into

   the air intake will not be permitted. 
H. Air diffusers will not be permitted.
  

  
                                                              Ignition

A. Only stock OEM distributors will be permitted. The distributor must maintain the
   factory mechanical advance curve to stock OEM specifications. Alterations and/or
   adjustments will not be permitted.
B. The ignition amplifier box (“rev box”) and coil must be mounted under the hood

   and on a panel behind the air filter shielded from heat (out of the driver’s reach)
   for ease of inspection. The black wire must be grounded to the motor. When the
   hood is removed the “rev box” must be clearly visible and not covered.
C. The car must be fitted with one (1) unaltered approved (rev) limiting box. The box

   and the chip must remain operable and in working condition, prior to, during and 
   after all racing events. (6200 RPM Max)
D. Trigger-type and/or crank trigger-type ignitions will not be permitted.
E. The ignition must be mechanically driven in the stock OEM location.
F. Only the stock OEM H.E.I. ignition coil will be permitted.
G. The wiring must remain as specified by the ignition amplifier box manufacturer.
H. One American Passenger Car sized battery with terminals on top and a

   maximum of 12 volts will be permitted. The battery voltage must not measure
   more than 14.3 volts. Step up transformer and/or any other device designed to
   increase voltage will not be permitted.
I. OEM stock firing order must be maintained for all engines. Standard GM Firing

   Order 18436572.
J. Ignition amplifier boxes, “rev boxes”, RPM limiting chips, may be inspected,

   confiscated and/or exchanged at any time. (6200 RPM Max)
K. Traction control devices will not be permitted. Braking devices that control

   traction will not be permitted.
L. Track officials reserve the rights to analyze and/or switch ignition boxes and/or

   rev chips at any time.
 
 
                                       Lubrication/Oiling System/Oil Cooler

A. Only a single wet sump oil pump will be permitted. Dry sump oil systems will not
   be permitted.
B. Only magnetic steel oil pans will be permitted. 
C. External type oil pumps and/or vacuum pumps will not be permitted.
D. Accu Sumps will not be permitted.
E. Engine evacuation systems by internal and/or external driven pumps or by

   connection between exhaust system and/or valve covers, intake manifold and/or
   oil pan will not be permitted.
F. Oil coolers will not be permitted.
 
                                                             Driveshaft

A. Only one (1) drive shaft connected from the transmission to the center section of
   the rear end will be permitted.
B. Two (2) driveshaft hoops / rings a minimum ¼”-inch thick x 2”-inch wide magnetic

   steel must be positively fastened by two (2) 3/8”-inch grade 5 bolts to the frame
   and/or torque arm side plates installed around each universal joint.
C. The drive shaft must have some type of drive shaft cover/shield. Cars with open

   drive shafts must have a drive shaft tunnel a minimum of 1/8”-inch thick by 6”
   wide magnetic steel extending from 2”-inches under the front edge of the seat
   and up the back of the seat 4” covering the transmission, drive shaft and the
   universal joint(s) and output flange on top and both sides. The tunnel must
   extend down to the floorboards. The cover must be positively fastened with a
   minimum of four (4) 3/8”-inch diameter bolts at the bottom connected to a
   crossmember. The cover must be a solid unit with no cuts and/or holes and/or
   removed material for the purpose of weight reduction. The only hole may be for
   the gear shift control. 
D. Closed drive type cars, torque tubes and/or bells that already have a 360-degree

   cover from the universal joint back to the seat will be permitted.
E. Carbon fiber, titanium, and/or other materials (considered exotic) will not be
   permitted anywhere in the car.
F. Only magnetic steel drive shafts will be permitted. Titanium and/or aluminum

   drive shafts and/or drive shaft yokes and/or driveline components will not be
   permitted.


  
                          Transmission/Driveline and Driveline Components

A. Only approved North American and/or Canadian manufactured manual shift
   transmissions will be permitted. Automatic and/or automatic-type transmissions
   will not be permitted. 
B. Overdrive and/or under-drive transmissions will not be permitted. 
C. Running through reduction gears will not be permitted. The transmission must

   be direct drive to the rear end.
D. The transmission must have working gears. Forward, neutral and reverse must

   be working. From the neutral position and with the motor running, the car must
   be able to go forward and/or a backward in a smooth manner. The car must start
   and move under its own power.
E. The transmission must bolt to the bell housing.
F. Driveline components made of carbon fiber, titanium and/or other materials

   (considered exotic) will not be permitted.
G. A maximum of two (2) universal joints per driveline will be permitted
 
                                        Engine Cooling System/Radiator

A. Any stock style water pumps will be permitted.
B. The cooling fan for the radiator must be mounted in the stock OEM location on

   the front of the water pump. Fans mounted to the crankshaft will not be
   permitted. Electric cooling fans and/or pumps will not be permitted.
C. Auxiliary cooling tanks and/or overflow cans and/or canisters will not be

   permitted in the cockpit.
D. Only one (1) radiator will be permitted. The minimum width of the radiator will

   be 20”-inches when measured from the outside edge(s) of the radiator. The
   radiator must be mounted vertically in front of the engine. The minimum height
   of the radiator must be 22”-inches when measured from the bottom of the frame
   rail vertically. Radiators mounted on an angle will not be permitted.
 
                                                           Rear End

A. Only Quick-Change type rear ends will be permitted.
B. Hypoid-type and/or Nine (9”) Ford-type and/or limited slip-type and/or lockers

   and/or two speed rear ends will not be permitted. Non-Quick-Change Rear Ends
   not permitted
C. Only aluminum and/or magnetic steel spools will be permitted.
D. Only steel and/or aluminum rear spindles will be permitted. If the rear spindle is

   machined from aluminum it must be a one-piece tube and spindle with a
   minimum outside diameter 2-7/8” and a maximum 2-1/2” inside diameter.
E. Live rear ends with aluminum tubes will be permitted. All others must be

   approved.
F. Carbon fiber, titanium and/or other materials (considered exotic) for any rear

   end component will not be permitted. Tungsten or any other exotic metal are not
   permitted, in any form. 
G. A maximum rear end offset of 4”-inches from the center of the inside tire width

   when measured from the inside of the left rear tire to the inside of the right rear
   tire at axle height. Refer to the drawing at the back of this rule book.
H. Aluminum rear end tubes only, with a maximum wall thickness of .410”. Outer

   diameter cannot exceed 3”. 
I. Outer collars (other than to attach bridge cage) are not permitted. Excessively

   thick or enlarged brackets are not permitted. All brackets must be aluminum.
J. Drive Axles must not exceed 1.600” diameter and must be made of steel only. No

   tungsten. Inserts to be slid inside of tubes, made of any material, are not
   permitted.
K. Ballast inside, attached to, or machined into hubs are not permitted. Maximum

   hub 10 lbs.
 
                                        Fuel, Fuel Cells and Fuel Systems

A. Fuel coolers of any type will not be permitted.
B. All cars must have fuel cells that meet and/or exceed SFI 28.1/.2 and/or FT3

   specifications. The fuel cell must have a maximum capacity of 24.5 US gallons and
   must remain in a rectangle and/or square shape for measuring and calculating
   capacity. The fuel cell must be mounted securely in its container and centered   
   between the frame rails. Pressure tanks on fuel systems will not be permitted.
   Auxiliary fuel tanks will not be permitted. No dry ice or any other cooling agents
   will be allowed on the motor during competition. 
C. The maximum capacity of the fuel when measured empty and/or dry will be

   measured in cubic inches utilizing the standard formula of length (minus ½”-inch)
   x width (minus ½”-inch) x depth (minus ½”-inch) will be 5,660 cubic inches.
D. The foam in the fuel cell must remain unaltered. A minimal cut in the foam will

   be permitted in the shape of a square or a rectangle. The cut may be no more
   than 1,000 square inches. The foam must retain the factory cut.
E. The fuel cell must be enclosed completely in a rectangle and/or square container

   that is a minimum thickness of 20-gauge magnetic steel. An aluminum container 
   may be used as an option and must be a minimum of .060”-inch in thickness.  On
   the bottom of the fuel cell, a piece of .090-guage material (aluminum and/or
   magnetic steel – in addition to the existing container) must be used at the bottom
   of the fuel cell container to prevent bowing and/or deflection. The .090-guage
   material must have an inspection hole drilled near the center of the piece to
   measure the thickness of the material. A 1”-inch x 1”-inch x .0625”-inch thick
   magnetic steel square tubing rack must be fabricated on the top, front and rear  
   sides of the fuel cell container. The square tubing must be a minimum of
   5”-inches from the outside edge of the fuel cell on either side. The rack may be
   fastened to the bottom of the fuel cell can utilizing a piece of magnetic steel angle
   material that is a minimum of 1”-inch x 1”-inch with a minimum material thickness
   of .065”-inch magnetic angle steel that is on all four (4) sides of the container.
   Drilling multiple holes and/or any attempt to lighten any piece within the fuel cell
   container and/or rack will not be permitted. The measurements taken in regard to
   the fuel cell container will be measured on an inside-to-inside basis. A tolerance
   for material thickness will be calculated and permitted for dimensions, however
   there will be no tolerance for expansion and/or containers that are larger than
   the minimum. 
F. Only one mechanical fuel pump in the stock location will be permitted. Fuel must

   be delivered through the fuel system from the fuel cell to the mechanical fuel
   pump. Fuel systems that require a return line, a pressure regulator of any type
   and/or other volume and/or pressure altering device will not be permitted.



  
                                   Exhaust - Muffler and Sound Reduction Devices

A. No Tri-Y Headers.
B. Mufflers Mandatory.
C. The complete exhaust system must be sealed. Any type of add on, return

   system and/or exhaust evacuation system will not be permitted.
 
                                                       Weight / Ballast

A. Any car utilizing any aluminum wheel(s) must weigh a minimum of 2,400 lbs
   following the completion of any event. (ZERO TOLERANCE)
B. Any car utilizing all steel wheels must weigh a minimum of 2,300 lbs following
     the completion of any event.   (ZERO TOLERANCE)
C. Ballast and/or weight may not be mounted to the roll cage above the rear deck.
D. All added weight(s) must be securely attached to the frame below the body

   decking.
E. Frame is defined as the steel welded structure only. 

F. Any part that moves or is not a fixed component to the steel frame structure
   may not be used for any weight attachment.
G. Weights attached to the rear bumper and/or outside the frame will not be

   permitted.
H. All weight must be securely bolted on, painted a bright color and have the cars

   number painted on it.
I. Any car losing a weight during any race will be disqualified.

 
                                                
                                                 Driver Compartment

A. Rear panhard bar adjustment devices will not be permitted in the driver compartment. Any rear panhard adjustments that have a knob and/or an adjustment device outside of the cockpit must be wired in a fixed position for competition. Adjustable panhard devices of any type will not be permitted during competition.
 
                                                       Suspension

A. Suspension designs and applications are constantly evolving.  Although the intent of the suspension rules are an attempt to accommodate the majority of suspension and suspension component designs and applications currently being used in competition, the rules cannot be absolute.  Any and all new designs or modifications to an existing suspension and/or suspension component must be communicated to and approved by the Track Officials.
 
                                                          Front End

A. The front axle must be a straight, one-piece axle manufactured from magnetic
   steel tubing. Only approved camber adjustments and/or camber adjustment
   devices will be permitted. Any other camber adjustments and/or will not be
   permitted.
B. Split axles and/or dropped axles and/or independent front suspension(s) will

   not be permitted.
C. All brackets on the front axle must be welded and/or bolted. Bird cages and/or

   sliders will not be permitted.
D. Only approved Modified front spindles will be permitted.
E. Bearing shafts that are made of steel are recommended.
F. The chassis may be offset a maximum of 4”-inches from the center of the inside

   tire width measured from the inside of the left front tire to the inside of the right
   front tire at axle height.


                                                  Shock Absorbers

A. No large body or remote reservoir style shocks.
B. No external adjustments other than gas through Schrader valve.
C. Any shock can be claimed after the feature for $200.00 Cash.



 
                                         Suspension Components

A. independent front and/or rear suspensions will not be permitted. 
B. A-Frames and/or ball joints will not be permitted for steering axis (kingpin only). 
C. Four-wheel steering actuated by the steering wheel and/or of any type will not

   be permitted.
D. All suspension systems (including travel limiters) and designs must be

   mechanical. Hydraulic, pneumatic (air), electronic, radio and/or computer
   assisted for adjustments, and/or in-or-out of cockpit type suspensions, and/or
   suspension adjustment systems will not be permitted.
E. Traction control of any type, including within the braking system is not permitted.
F. Only a single brake bias and single rear panhard adjustment will be permitted in

   the cockpit. Any other type of adjustment will not be permitted in the cockpit.
G. Spring rods allowed on right rear radius rod only. Must be a conventional

   approved spring rod. No externally mounted shocks attached to radius rod. No
   Rubber biscuits allowed on the left rear radius rod.
H. Only conventional type aluminum birdcages currently being used are allowed.

   Maximum bracket thickness 1”. Any new birdcage designs must be approved. 
I. The only materials used to fabricate axle housing mounts (birdcages) that will be

   permitted is aluminum or magnetic mild steel.  Axle housing mounts fabricated
   of exotic, heavy materials will not be permitted.
J. When fabricating axle housing mounts detail must be paid to functionality. 

   The completed axle housing mounts, when comparing the right and the left side,
   must be as similar in design as possible.                                                     
                              Rear Suspension Attaching (Radius) Rods
K. The only materials used to fabricate attaching (radius) rods that will be

   permitted are magnetic steel or aluminum   
L. Aluminum attaching (radius) rods may be solid or tubular material.  Magnetic

   steel attaching (radius rods) must be tubular with a maximum wall thickness of
   3/16 inch.


                                                           Springs

A. Any type and/or form of spring will be permitted (torsion bar, coil and/or leaf
   spring).
B. Coil springs must be manufactured from magnetic steel.  Leaf springs must be

   manufactured from either magnetic steel or approved composite material.
C. Spring preload adjustments for coil springs must be made using mechanical

   adjusting nuts on the shock body.
D. Spring preload adjustments for leaf springs must be made using a mechanical

   adjusting device such as an adjustable shackle or threaded rod type mount.
E. Other than spring dampening by the shock absorber, hydraulic, pneumatic, or

   electrically controlled adjusting devices, (static or dynamic) that affect spring
   preload or race car heights will not be permitted.



                                              Wheelbase and Tread Width

A. The maximum front tread width will be 86”-inches with a minimum of 74”-inches.
   The maximum rear tread width will be 86”-inches with a minimum of 74”-inches.
   These measurements will be taken from the outside edge of the sidewall of the
   tires on each side.  


                                                            Wheels

A. Aluminum or steel wheels will be permitted for competition. Magnesium, steel,
   carbon fiber and/or any other exotic type material will not be permitted.
B. ‘Bleed-off’ and/or ‘Bleeder’ valves will be not be permitted. 
C. The maximum rim width will be 14”-inches when measured from the inside of

   left bead to the inside of the right bead of the wheel. Only wheels 15”-inches in
   diameter will be permitted.
D. Beadlocks will be permitted. Any wheel utilizing a beadlock must maintain a

   minimum diameter hole of 11” or 5” inches inside the beadlock and the wheel.
   Beadlocks may only be used on the outside of the wheel.
E. Wheel spacers must be aluminum. 
F. Aluminum or steel wheels allowed. Maximum wheel weight 28 lbs.  Weights of

   any kind, added to wheels other than conventional balancing, are not permitted.
G. Wheel covers: 5 and 3 mounting point wheel covers will be allowed for

   competition under the following conditions: Wheel covers having a minimum of 5
   attachment points may continue to use steel dzus fasteners. Said dzus fasteners
   must be made of steel only. Wheel covers having only 3 attachment points must
   be bolted-on at all 3 points utilizing a minimum 5/16”, flanged steel bolt and an
   approved fastening (nut assembly) system.   Approved fastening (nut assembly)
   systems:  Keyser Manufacturing, part #100 7-101.   Wehrs Manufacturing  Part
   # WM377A-312 Aluminum 5/16 / WM377S-312 Steel 5/16  Triple X Chassis Part
   #  SC-WH-7810(for a 1” spring)  / SC-WH-7820(for a 1 3/8” spring)  Pit Stop USA
   Part #:   Smith Precision Products Part # MC-516-18  Optional fastening systems
   that are equal or superior to the above-approved system will be readily approved
   at the sole discretion of WoO Technical Officials.  
H. Foam inserts may be permitted
I. A minimum of five (5) lug nuts on the rear wheels will be required. A minimum of

   three (3) lug nuts will be required on the front wheels. Knock off hubs of any type
   on any wheel will not be permitted.


                                        
                                                              Tires

A. American Racers and Hoosier Northeast Dirt Modified Tires Only.
B. A minimum compound will be voted on.
C. No block tread or late model type tire allowed.
D. Buffing, Cutting, Grooving, and Siping will be allowed.
E. Tire Marking from manufacturer cannot be altered.

                                
                                                 Traction control devices

A. All electronic and/or computerized wheel spin and/or ignition retardation and/or
   acceleration limiting and/or traction control devices of any type will not be
   permitted.
B. Adjustable ping control devices, timing controls and/or automated throttle

   controls will not be permitted.
C. Adjustable restrictor plates will not be permitted.
D. Remote control components of any-type will not be permitted.
E. Radios and/or devices for transmitting voice and/or data will not be permitted,

   unless otherwise authorized prior to any event.
F. Data acquisition systems will not be permitted.


 
                                                       Chassis/Frame

A. All frames must be fabricated utilizing 2”x4” rectangular magnetic steel tubing
   with a .120” wall thickness. Only 2”x4” rectangular box frames between the front
   and rear axle centers will be permitted. The 4”-inch side of the rectangular tubing
   must remain in the vertical position. For the purpose of inspection one 3/16”
   diameter hole may be drilled in each frame rail. Other holes will not be permitted.
   Round tubing must be either 1-1/2” outside diameter (if used for main hoop must
   be .125”) and/or 1-3/4” outside diameter with wall thickness of .095”inches.
B. Frame width will be as follows; At the front shock towers a minimum 24” and a

   maximum of 35”-inches. Rear of the car is a minimum of 26” with a maximum of
   35”-inches. The minimum frame width at the rear roll bar must be 26”-inches. All
   measurements will be taken from the outside of the frame rails, at the top and   
   bottom of the frame rails and its longest length. Clips, sub-frames, etc., will be
   considered a part of the frame. 
C. The minimum length of the 2”x4” frame rails begins 14”-inches in front of the

   centerline of the rear axle and extends to the front of the radiator. The left and
   right rails (both top and bottom) must be equal in distance from the driveline
   centerline along the total length of the frame. Offset frame rails will not be
   permitted. A maximum 4”-inch indent in the lower left rear frame rail for
   suspension clearance will be permitted. The two (2) upper frame rails in the
   engine compartment may be altered for engine clearance only.
D. The kick-ups must meet the same specifications as the roll cage and/or frame

   material. 
E. Titanium and/or carbon fiber material(s) will not be permitted on the chassis

   and/or frame.
F. There must be a minimum of 2-1/2”-inches ground clearance from the chassis

   at its lowest point.
G. Ground effects will not be permitted.

                                         
                                           Seat Location and Mounting in Frame

A. The seat and steering wheel must be centered in the frame. Offset mounting
   of the seat and/or steering wheel will not be permitted.
B. The bottom rear of the seat must be a maximum of 16”-inches from the

   centerline of the rear axle. Refer to the drawing at the back of the Dirt rule book.                                    
 
                                               BODY STYLE AND DIMENSIONS
                
ALL MEASUREMENTS WILL BE TAKEN WITH DRIVER AND/ OR WITH OR WITH OUT FUEL. TOLERANCE PERMITTED ON ALL BODY DIMENSIONS IS MAXIMUM OF +/- (PLUS OR MINUS) ½”-INCH (ONE-HALF INCH). THIS IS A TOLERANCE, NOT A DIMENSION THAT IS INTENDED TO BE ADDED TO THE BODY DIMENSIONS.
 
 
                                                        General Body
A. Mirrors and/or reflective devices will not be permitted.
B. Track Officials reserve the right to request body and/or sheet metal to be

   replaced and/or painted if it has any sharp edges and/or does not appear
   presentable. Presentable is at the discretion of the Series Official.
C. The maximum rear spoiler height, regardless of ride height, may not exceed

   50”-inches. The rear spoiler must be able to provide the driver following a view
   of the track ahead.
D. A full magnetic steel windscreen and/or rock guard is required. The windscreen

   and/or rock guard must have an individual hope opening of 2” x 1” with a
   minimum of 1/16” thickness. Chicken wire type and/or aluminum screens will not
   be permitted. The windscreen and/or rock guard must cover the entire windshield
   area across the front of the roll cage and from the top of the roll cage down to the
   base of the cowl and/or hood. In addition clear lexan-type and/or safety glass
   windshields will be permitted. If the lexan and/or safety glass is utilized it must be
   shatterproof and mounted behind the windscreen and/or rock guard. Any
   additional windshield must not obstruct the driver’s exit of the vehicle.
E. The minimum size opening for the side windows will be 12”-inches in height by

    18”-inches in width by 30”inches in depth. A rectangular box, matching these
   dimensions may be used to pass through the car from one side window through
   to the other. 
                                                
                                                         Body Material
A. Only magnetic steel and/or aluminum will be permitted for all inner and outer
   body panels.
B. Vertical material (plastic and/or rubber-type), with a material thickness between

   .090”-to-.125”-inch and a minimum height of 8”-inches from the bottom of the
   quarter panel will be permitted, provided both doors and/or quarter panels
   maintain the same length and height with or without the plastic (symmetrical).
   An overlap of two (2”) inches to secure the door(s) extensions will be permitted.
   The door(s) must maintain a minimum of six (6”) inches of ground clearance
   including the additional material extending below the metal body. The overall 
   dimensions of the door(s) and extensions must meet the specifications. 
C. Only a single piece fiberglass roof will be permitted.
D. Only fiberglass and/or aluminum hood, hood scoop, windshield cowl, rear

   interior tire clearance cover will be permitted
E. Only clear lexan will be permitted for the rear spoiler and rear wing windows.

   Decals and/or lettering will not be permitted on the rear spoiler and/or rear wing
   windows.
 
                                                                 Roof
A. A one-piece fiberglass roof, single ply, one contour inside and out will be
   permitted. Carbon fiber and/or any other composite type materials will not be
   permitted. All roll bars must remain exposed. Vertical material of any type used
   to mount the roof that may cover the roll bar will not be permitted. The roof
   must weigh a minimum of 10 lbs.
B. The roof must be centered from side-to-side on the roll cage and on the frame.

   Offset bodies will not be permitted. The leading edge of the roof must be
   positively fastened in a stationary position a minimum of 33”inches and a
   maximum of 48”-inches in front of the rear axle centerline. The roof must be
   securely and positively fastened on all sides.
C. The minimum length of the roof is 47”-inches with a maximum of 60”-inches.

   The minimum width of the roof is 48”-inches with a maximum of 52”-inches.
   The roof must be of the turtleback style and shape with a minimum of ¾”-inch
   belly from front-to-rear and ¾”-inch from side-to-side. The roof -contour must fit
   the DIRTcar roof template patterns. Flat roofs will not be permitted. The
   maximum front lip must be ½”-inch. The maximum side edge(s) must be
   1-1/8”-inch break. Refer to drawing (NUMBER) on page (NUMBER).
D. Changes to the shape and/or location of the roof at any time during competition

   will not be permitted.
E. The maximum overall height of the car is 62”-inches with a minimum of

   53”-inches measured from the ground.
F. The maximum roof angle is 5 degrees when measured with the DIRTcar gauge.

G. Any proposed roof design that deviates from the preceding rules must be
   submitted to DIRTcar for approval and approved before being presented for
   competition.
 
                                                     Front Door Panels
A. Only a one (1) piece magnetic steel and/or aluminum front door posts and/or
   ‘A’-pillars a minimum of .050”inches with a maximum of .090”-inches will be
   permitted. The front door posts must be securely mounted to the roof and to the
   door(s). The side of the front door post must measure a minimum and maximum
   of 2”inches. The front door post may be bead rolled and/or have a lip and/or
   flange for re-enforcement, but the reenforcement must not exceed a maximum
   3/8”-inch in width.
B. The door post may be fastened with a minimum of two (2) 3/16”-inch bolts to

   the door bracket for ease of fabrication.
C. Additional material, air directional devices, lexan vent windows and/or excessive

   material will not be permitted in the corner of the front door post, where the post
   meets the door panel. 
D. There will be no tolerance on the front door post measurements.
 
                                  Rear Wing Windows / Side View / Rear View
A. All rear wing panels and windows must resemble a current production OEM
   style body. Only manufacture approved rear wing panels and windows will be
   permitted for competition. Any non-manufacture rear wing panel must resemble
   and/or meet the criteria as the submitted rear wing panels and/or windows.
   Any rear wing panel that is submitted for competition must not exceed
   815 square-inches in total area. All rear wing panels must be submitted for
   approval prior to introduction into competition.
B. The upper profile must not extend above a straight line projected from the rear

   of the roof to a point 3”-inches higher than the rear deck. A minimum 2”-inch
   indent in the profile, so as not to make the panel a fast back is mandatory.
   (Please refer to the Dirt drawing and photographs) 
C. The maximum base length will be 61”-inches. The left and right must be of the

   same style and dimensions (symmetrical).
   (See example of Dirt Body Style Drawing)
D. All rear wing(s) must have an opera-type window. The window must be lexan.

   Bends or breaks in the Lexan area of the window will not be permitted. 
E. Only one break as a change in body line/contour will be permitted in the rear

   window panel.
F. Decals and/or lettering will not be permitted on the rear windows.
G. The rear view of the wing window must go in a straight line from the top of the

   quarter panel (tangent) or bodyline to the roof with a maximum gradual bow of
   2”-inches in the center of the wing window.
H. Flanges and or additional material added to the rear window panel for the

   purpose of directing air flow will not be permitted.
 
                                      Body Width and Ground Clearance
A. The body width, when measured at any point along the body line from front-to-
   back will be a maximum of 68”inches and a minimum of 64”-inches.
B. A minimum chassis ground clearance of 2 ½”-inches will be permitted.
C. Fan and/or ground-effect cars will not be permitted.
D. Rubber skirts, fins, air directional devices and/or spoilers of any type under the

   car will not be permitted. A 2” inch maximum air deflector in front of the radiator
   for engine cooling will be permitted.                                            
 
                                                         Door Panels
A. The side door panel(s) will be a maximum of 86” inches and a minimum of
   60”-inches in front of the centerline of the rear axle when measured along the
   top plane.  The door(s), front door extensions and rear quarter panels must be
   flat and mounted in a vertical position. They must remain flat. Flanges at a
   90-degree angle may be added to the front of the doors. The flange may only
   be added for the purpose of strengthening the door material the flange must
   not exceed ¾”-inch in length or width and must be mounted in a vertical position.
   Door flanges must face inward toward the centerline of the chassis. Louvers,
   bead rolls holes and/or protrusions from top-to-bottom will not be permitted.
   Holes will be permitted for rub rails/nerf bars. A maximum 1”-inch long lip/flange
   at a 45-degree outward angle ½”-inch away from the sheet metal for
   reinforcement will be permitted at the top and bottom of the door(s) panels.
   All outside sheet metal, door panels, door extensions, air dams, front nose
   and/or hood fins must be the same shape, size and angle on both sides of the car.
   The door(s) must match each other from side-to-side (symmetrical). Air directional
   devices and/or side mounted spoilers of any type, which extend past the outside
   edge of the flat plane of the body will not be permitted.
B. Bead rolls around the outside perimeter of the door panels and the wing

   windows will be allowed. Bead rolled edges must face toward the center of the
   chassis.
C. The top of the door when measured from the ground will be a maximum of

    38”-inches and a minimum of 30”-inches when measured 60”-inches from the
   rear axle centerline. The rear of the door when measured from the ground will
   be a maximum of 42”-inches to the top of the door when measured 16”-inches
   from the center of the rear axle centerline of the rear forward. 
D. The ground clearance on the bottom of the doors must maintain a maximum of

   12”-inches and a minimum of 6”-inches from the ground.
E. A maximum lip and/or flange of 1-1/2”-inches rounded at 90 degrees and facing

   inward only, on the top and bottom door(s) and rear quarter panel(s) will be
   permitted.
F. A lip and/or flange angled out at a maximum angle of 45 degrees, extending

   away from the door at a maximum of ½”-inch and a maximum of 1”-inch in length
   before it bends inward for strength at the top of the door(s) and/or rear quarter
   panel(s) will be permitted.
 
                                                 Rear Quarter Panels
A. The rear quarter panels must be symmetrical in height, with or without plastic.
B. The rear quarter panels must be a maximum of 47”-inches and a minimum of

   40”-inches from the ground at the rear and continue in a straight line with the top
   of the door. (See drawing.).
C. A maximum 2”-inch fender flare may be used, but the overall body width must

   maintain a maximum of 68”inches.
D. The rear quarter panels may extend rearward a maximum of 48”-inches when

   measured along the top plane of the rear quarter panel and a minimum of
   44”-inches at the bottom when measured from the center of the rear axle to the
   rear of the car.
E. A maximum of 16”-inches and a minimum of 8”-inches of ground clearance

   (when measured from the ground to the bottom of the rear quarter) will be
   permitted. 
F. The plastic / rubber material utilized on the rear of the car may extend a

   maximum of 16”-inches from the ground to a minimum of 8”-inches from the
   ground on either side of the car (symmetrical). 
G. The panels may have one side plastic on one (1) side only provided the panel

   remains completely symmetrical. 
H. Flanges at a 90-degree angle may be added to the Rear Quarter Panels. The

   flange may only be added for the purpose of strengthening the Rear Quarter
   Panel. The flange must not exceed ¾”-inch in length or width and must be
   mounted in a vertical position. Rear Quarter Panel flanges must face inward 
   toward the centerline of the chassis. Air directional devices and/or side mounted
   spoilers of any type, which extend past the outside edge of the flat plane of the
   body will not be permitted.
 
                                                     
                                                           Rear Spoiler
A. A one piece, clear Lexan spoiler with a maximum height of 5”-inches from the
   rear deck will be permitted. Lettering and/or decals will not be permitted.
B. The rear spoiler must be non-adjustable from the cockpit and/or during racing

   conditions. Hinges, adjuster(s), slides and/or any other adjusting type device will
   not be permitted. 
C. Metal gurney and/or table and/or flanges and/or lips will not be permitted.
D. A brake and/or bend on the top of the Lexan spoiler will be permitted for

   reinforcement. Maximum 1” lip.
E. The maximum overall height of the spoiler when measured from the ground

   must not exceed 50”-inches.
F. A maximum of four (4) of vertical supports (a maximum of 2”-inches in vertical

   height and 10”-inches in length) for the purpose of fastening the spoiler to the
   rear deck will be permitted.
 
                                                                 Rear Deck
A. The maximum height of the rear deck when measured from the ground will be
   47”-inches and a minimum of 40”-inches.
B. The rear deck lid must be fully enclosed from side-to-side and have a maximum

   height of 14”-inches and a minimum 9”-inches, vertically behind the fuel tank.
C. The left and right rear trunk lids must be symmetrical in size and shape and

   must remain flat to cover the fuel filler hose and apparatus. The panel must
   completely cover the fuel cell, the fuel filler hoses and the vent lines.
D. The fuel tank must be completely enclosed from the bottom of this panel to

   the bottom of the fuel cell.
E. The fuel cell must have both sides completely covered in sheet metal in addition

   the container it is enclosed in. Openings of any type will not be permitted.
F. Openings from the top of the fuel cell to the bottom of the trunk lid will not be

   permitted.
G. All vent line nozzles used for the purpose of a catch must be mounted on the

   left side of the quarter panel.
                                                    
 
                                                Hood, Nose and Front Spoiler
A. The maximum width for the hood, nose and front spoiler will be 36”-inches with
   a minimum width of 24”-inches. Louvers will be permitted on the sides of the
   hood.
B. The nose-piece must not extend rearward of the front shock towers.
C. The front spoiler must be a separate piece. 
D. Shock absorber covers and/or deflectors must not be a part of the nose or the

   spoiler and/or positively fastened to the nose in any fashion exceeding the
   36”-inch maximum width.
E. Fabric material shock absorber covers will be permitted. The covers must not

   be used to achieve any aerodynamic advantage and/or to deflect air in a
   positive manner.
F. The maximum the spoiler may extend in front of the front axle centerline

   will be 20”-inches.
G. The front spoiler must be non-adjustable (hinges and/or sliders will not

    be permitted).
H. The hood shall be considered from the front roll cage to on top and in-line

   with the front of the radiator.
I. The hood and nose may have a maximum lip and/or flange of 2”-inches on

   both sides following the contour of the body. They must remain symmetrical.
J. The hood and nose be centered on the centerline of the frame.
K. The hood, nose and/or spoiler must not overlap each other’s location on the

   frame.
L. Any part of the hood must not exceed 10 degrees and the sheet metal must

   not have an opening and/or extrusion between the hood and the nose.
M. The hood must extend over the radiator and have complete sides. 
N. The front spoiler may have a lip and/or flange a maximum 2”-inches on both
   sides following the contour of the spoiler not exceeding the maximum width of
   36”-inches. The front spoiler may be offset 1”-inch from the centerline of the
   frame to the right or the left. One 2” high wicker bill may be added horizontally
   to spoiler in front of shock towers.
 
                                                              Hood Scoop
A. The hood must be fully enclosed.
B. There are two (2) types of hood scoops that can be mounted on top of the hood

   for the purpose of enclosing the carburetor and/or ram air. Ram Air will be
   permitted providing they meet the following specifications in this section.
C. The ram air scoop: A maximum 30”-inch length when measured from the rear

   motor plate to the front of the hood scoop will be permitted.  A maximum width
   of 18”-inches will be permitted. The maximum 6”-inch front vertical opening at
   the beginning of the scoop will be permitted.  A minimum of 8”-inches will be
   required from the highest point on the hood scoop to the lowest point on the
   front of the front of the roll cage and/or the roof. The hood scoop must be
   positively fastened to the hood and completely enclose the carburetor and
   the air filter.
D. The conventional air scoop (non-ram air): A maximum of 25”-inches is permitted

   from the center of the carburetor forward to the end of the hood scoop. A
   maximum width of 22”-inches will be permitted. A minimum of 8”-inches will be
   required from the highest point on the hood scoop to the lowest point on the
   front of the front of the roll cage and/or the roof. The hood scoop must be
   positively fastened to the hood and completely enclose the carburetor and the
   air filter.
 
                                                Interior Sheet Metal
A. All horizontal body support(s) other than the inner pods, whether in the front
   and/or rear must be a minimum of 1” x 1” .095”-inch thick tubing or 1”-inch flat
   stock a minimum of .125”-inch thick. 
B. Inside and/or outside wings, spoilers, air foils and/or wind deflectors will not be

   permitted.
C. Double panels and/or sheet metal that is designed to create a wing effect will

   not be permitted.
D. A maximum 1”-inch reinforced flange will be permitted on all lexan, however,

   all specified measurements must be retained.
E. All interior sheet metal must completely cover all interior areas, door-to-door,

   quarter panel-to-quarter panel. Holes and/or openings will not be permitted in
   this area.
F. Front and rear firewalls are required. The front firewall must isolate the cockpit
   from the engine compartment. The rear firewall must extend from the top of the
   fuel cell to the belly pan to isolate the cockpit from the fuel cell. The firewall must
   be a minimum of .050”-inch thick aluminum and/or magnetic steel. The firewall
   may be altered and/or cut for drive shaft clearance. 
G. Vertical fins, air dams and/or fairings on either side, behind the roll cage will not

   be permitted.
H. All sheet metal must be a flat single plane across the interior of the car. Two (2)

   bead rolls or breaks for the purpose of strengthening and maintaining the shape
   of the wing will be permitted. The maximum bead roll and/or break permitted will
   be 1/8”-inch in height and ½- “-inch in width.
I. Covered roll bars will not be permitted. Sheet metal that is one-piece and/or part

   of a body panel formed around tubing that is not considered an aerodynamic
   advantage will be permitted, provided there is no excess sheet metal.
J. Louvers will be permitted for cooling purposes only, including the radiator, engine

   and/or working oil cooler. Louvers and/or holes in the interior or exterior sheet
   metal will not be permitted. 
K. The floor and/or belly-pan may not be any wider than the frame at any point.

   Lips, fins and/or air directional devices on the floor and/or belly pan will not be
   permitted. Louvers for the purpose of cooling will be permitted on the belly pan
   from the radiator to the firewall. The under pan must not extend in length past
   the rear of the seat and exceed the width of the frame rails of the car and must
   be a maximum of .090”-inches in material thickness.
L. Only aluminum belly pans will be permitted. Panels under the rear and and/or

   the fuel tank will not be permitted.  
                                             
                                                    Driver Compartment
A. A full metal firewall fabricated from magnetic steel and/or aluminum must
   encompass the driver’s compartment from front-to-rear, on both sides and floor
   boards.
B. The driver’s seat must be a high back aluminum seat, designed specifically for

   racing, located on the left side of the car and mounted per the manufacturer’s
   instructions securely to the frame.
C. The seat design should be one from a current manufacturer and/or

   recommended to include the full containment design. Installation of the full
   containment seat should follow the manufacturer’s instructions.
D. All cars must be equipped with a quick-release type steering wheel.
E. The driver compartment must have a starting switch and/or button within

   reach of the driver.
F. A clearly labeled electrical on/off ‘kill’ switch must be within reach of the driver.
G. Mirrors of any-type will not be permitted.
H. Radios and/or electronic and/or data communication devices will not be

   permitted.
I. Any edge and/or sheet metal end in and around the driver compartment must be

   protected with trim and/or beading and rounded. Sharp and protruding edges
   will not be permitted.
J. A substantial rock guard with a minimum of three (3) additional roll bars must be

   mounted in front of the driver. The rock guard must be made from wire screen.
   Windshield screens must be a minimum of .090-inches and must be securely
   fastened. 
K. Fuel and/or power steering lines and/or fittings running through the driver’s

   compartment must be made from an approved braided type of line. High
   pressure lines and/or fittings and/or hot fluid lines running through the driver’s
   compartment must be encased and/or must have a shield.
L. A fully charged fire extinguisher meeting SFI 167.1 specifications with an

   activation push and/or pull knob within reach of the driver is recommended.
M. Shoulder guards will be allowed on right side of drivers’ compartment but must
   be hinged on front edge and attached with Velcro on back edge as to not be
   mounted solidly.    
 
                                                 Numbers and Identification
A. The track and/or series Scoring Director reserves the right to issue and/or
   change a car number to prevent duplication and/or maintain proper records.
B. Team cars must be clearly identifiable from one another and use another

   number and/or letter.
C. All number and letter combinations will be limited to three digits. If three digits

   are used two (2) shall be the primary numbers/letter.
D. Number and/or letter combinations are required on the roof, nose, rear deck

   and both doors.
E. All numbers and letters must be a minimum of 18”-inches high on the roof

   and/or doors and 8”-inches high for the rear deck and the nose. All numbers
   and/or letters must be equal in size and displayed legibly whether decaled and/or
   painted. 
F. The nerf bars must not block the visibility of the number and/or letter

   combinations.
 
                                           Bumpers and Side Bars/Nerf Bars
General
A. All bumpers, side bars/nerf bars and/or bracing must be made from minimum
   1-1/2 diameter round .095--inch thick magnetic steel tubing only unless
   otherwise specified.
B. All edges and/or corners on bumpers and side bars/nerf bars must be rounded.

   Sharp edges will not be permitted.
C. The rear bumper and/or any side bars must not extend past the outside of the

   tire sidewalls on either the left and/or right side of the car.
 
Front Bumper
A. Only the front bumpers may be made from minimum 1-1/4 diameter round
   .095--inch thick magnetic steel tubing. 
B. The front bumper must consist of two (2) horizontal rails; an upper and a

   lower and a minimum of two (2) vertical braces, equally spaced, welded between
   the two (2) horizontal rails. The horizontal rails must be positively fastened to the
   frame with four (4) sockets and/or supports. The front bumper must remain
   exposed without covering and/or any sheet metal fabrication surrounding it.
C. The four (4) tubes that support the bumper from the four (4) frame sockets must

   be horizontal. These rails must be a minimum of 6”-inches and a maximum of
   12”-inches apart when measured from the top to the bottom and maintain that
   measurement for a minimum width of 24”-inches and a maximum width of
   30” inches. The front bumper must also have an 18”-inch center when measured
   from the ground up to the middle of the bumper. The total width of the front
   bumper must not exceed 30”.
D. The maximum the front bumper may extend from the centerline of the front

   axle is 24”-inches and a minimum of 20”-inches.
E. The front surface of the bumper must remain flat, parallel and perpendicular
   with the front of the nose piece for the full width of the bumper. V-shaped and/or
   any other type of shaped bumpers will not be permitted.
F. The end bracing tube of the front bumper must be fabricated on an angle in such

   a way as to prevent the bumper of another car becoming interlocked.
 
Rear Bumper
A. The rear bumper must consist of two (2) rails, an upper and lower, which must
   have a minimum of four (4) sockets and horizontal support bars positively
   attaching it to the frame. The upper and lower rails must also be a minimum of
   10”-inches apart and a maximum of 16”-inches apart from the top to the bottom
   and maintain that measurement for a minimum width of the 64”-inches and a
   maximum of 86”-inches.
B. The rear bumper must have an 18”-inch center when measured from the ground

   to the middle of the bumper.  
C. The maximum the rear bumper may extend back when measured from the

   centerline of the rear axle is 52”inches.
D. The rear surface of the bumper must remain flat and parallel with the back of

   the rear quarter panel for the full width of the bumper. V-shaped and/or any
   other type of shaped bumpers will not be permitted.
 
Rub Rails
A. Solid rub rails and inner hoops with ballast added inside or outside will not
   be permitted. 
B. The rub rails must be exposed and outside the body panels. The left side rub

   rail may extend a maximum of 2”-inches outside the left rear tire sidewall.
C. The rub rails must be bent with a gentle radius at a 90-degree angle and must

   protrude a minimum of 6” inches back in past the body.
D. The rub rails must be a minimum of 50”-inches long from socket-to-socket.

Bumpers and Rub Rails  
A. Only a minimum of 5/16” bolts with Nyloc nuts and/or DIRTcar approved quick
   release solid pins will be permitted for positively fastening bumpers and rub rails
   to the car. Cotter pins and/or other fastening devices will not be permitted.
   Double rub rails will be allowed on left side only.  Single rub rails only allowed on
   right side. 
B. All bumpers and rub rail sockets must have fasteners, pins and/or bolts with a

   minimum diameter of 5/16”-inch. 
C. The front and rear rub rails must have a 360 degree sleeve a minimum of

   3/8”-inch wide x .095” thick magnetic steel welded to the rub rail tube butted
   against the support socket to prevent pins from shearing. Refer to the drawing
   at the back of this rule book.

 
                                                              Brakes
A. All cars must have four (4) wheel hydraulic brakes in good working condition.
   Random brake inspection may take place throughout the season.
B. Carbon fiber, carbon, titanium, ceramic, aluminum pads and/or rotors will

   not be permitted.
C. On live rear axles, one inboard and one outboard brake assembly will

   be permitted.
D. Brake bias may be adjustable through the cockpit.
E. Manual brake shut offs will not be permitted, with the exception of the right

   front brake. An electronic brake shut off switch will also be allowed on the right
   front only.
F. Rear brake calipers must be approved aluminum 4 piston design and must be

   operational. Maximum rotor diameter 12.19” diameter by 1.25” thick and must
   be vented. No solid rotors with the exception of the 3/8” rotor.  

 
                                                           Roll Cage
A. Only round magnetic steel tubing 1-1/2” and/or 1-3/4” in outside diameter with
   a material thickness of 1-3/4”.095”-inches and/or 1-1/2”-.120”-inches will
   be permitted.
B. The roll cage must be an integral and structural part of the frame. All frames

   built in 2005 and after must have a manufacturer’s unique serial number plate
   visible and positively fastened on the left front roll cage upright. The letters
   and/or numbers shall not exceed 8 digits and be ½”-inch in height.
C. Front and rear roll bars must be positively fastened in a cage-type configuration.

   Two (2) round horizontal side bars on each side are required. The top side bar
   must be a maximum of 22”-inches below the top roll bar.
D. Proper bracing and triangulation on the front and rear roll bars is required. All

   roll bar bracing material must be 1-1/2”-inches outside diameter with a material
   wall thickness of .095”-inches. A minimum of one (1) 1” diagonal bar across the
   top of the roll cage is required.
E. The rear main roll bar hoop must be a minimum of 26”-inches when measured

   across the outside-to-outside of the hoop and maintain that measurement from
   the top to the bottom of the cage. The bottom of the rear main roll bar hoop
   must be positively fastened (welded) to the 2”x4” frame rails. Outriggers will not
   be permitted.
F. The front roll bar hoop must be a minimum of 26”-inches when measured across

   the outside-to-outside of the hoop and maintain that measurement from the top
   to the bottom of the cage, with the exception of the allowable frame taper.
   Outriggers will not be permitted. Refer to the drawing in the back of this rule
   book.
G. MANDATORY Frame/Roll Cage update: A piece of tubing, a minimum of

   1-1/4” in outside diameter and .095”-inches in thickness, must be installed
   vertically and must extend through the car into the bottom frame rail or extend
   back to the union at the top of the door and rear main hoop joint. The tubing
   must be installed in a manner that does not impede the driver exiting the cockpit.
   The tubing must be mounted a minimum of 9”-inches and a maximum of
   12”-inches on the roof bar from the existing rear roll cage hoop. This must be
   installed symmetrically on both sides of the roll cage. Existing cars must be
   retrofitted with this piece of tubing.
  
 
  
  
  
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