Pro mod


It is ultimately the obligation of each participant to ensure that their conduct and equipment complies with all of the applicable rules, as they may be amended from time to time; any amendments supersede any previous rules regarding any technical and/or aspect. An amendment is effective upon the date of the publication of the amendment regardless of when a competitor receives the actual notice.

Any new components, including engine components, suspension components, body designs, frame designs and/or components of any type utilized in competition must be approved by officials prior to being introduced into competition.


  1. GM pad number 19370602, 19258602 or 88958602 & GM part number 19318604 or 88958604.
  2. All engines are to remain sealed from the factory. These engines are sealed at the manifold, cylinder heads, front cover, and oil pan with special GM twist-off bolts or cap seals. The original factory seals (bolt type or cap seals) must remain unaltered. Tampering, removal, or modifications of any type and/or broken factory seals, bolt type or cap seals type, will not be permitted and will result in an immediate disqualification from the event (loss of points and money). The engine may be impounded immediately for further inspection.
  3. The exception to this will only be if a repair or rebuild is required. The repair/rebuild must be authorized by a Racing Series, at which time the engine may be repaired or possibly rebuilt per the guidelines set forth in the GM Technical Manual #88958668.
  4. DIRTcar, IMCA, FASTRAK, RUSH, Crate USA Generation Ill (yellow) & Generation IV (green) seals allowed. For any other sealing system, contact Freedom Tech for approval. Crate engines must not be altered, modified, or changed from factory specs.
  5. Engines must be sealed in all of the proper locations with either the factory GM twist off bolt heads or cap seals, series seal tags, or a combination of the “original” GM twist off bolts or cap seals and/or series seal tags.
  6. The sealed engines must remain intact and not be tampered with; any seals that have been tampered with, removed, or modified, and/or broken will make the engine illegal and will result in an immediate disqualification from the event (loss of points and money). The engine may be impounded immediately for further inspection. Modifying any internal engine parts or changing the parts from stock as delivered sealed from the factory will result in disqualification for the night’s event (loss of points and money), possible suspension from all competition for up to 365 days, and an indefinite probation.
  7. The permitted crate engines must not be altered, modified, or changed from the GM specifications set forth in the GM Technical Manual #88958668; no changes are allowed to the engine- intake manifold, heads, valve covers, front cover, oil pan, harmonic balancer, or any other part or parts on or in the engine.
  8. After much research it has been determined in some cases that original factory cylinder heads and valve springs do not meet the required correct install height. To correct this, shimming will be allowed to meet the correct install heights listed in the chart below. These updates will be published in a forthcoming version of the GM Technical/ Specification Manual.
Valve Spring   Specifications β€” New
Valve spring PIN102128111255148312551483
Valve springPIN-setof16n/a1249549412495494
Diameter +1- .010′1.340″1.340″
Free Height +1- .015″B2.021″2.154″
Installed Height (Ok to shim to proper heightC1.70″1.780″1.780″
Pressure Installed Height +1-5 lbsD80 lbs.110 lbs.110 lbs.
Open HeightE1.270″1.300″12300″
Open Pressure +1- 10 lbsF195 lbs270 lbs.270 lbs.
Coil BindG1.20″1.21″1.21
Wire Diameter.177″.178″.178″
  1. New Beehive (blue) Valve Springs:
Valve Spring Specifications β€”New Blue Beehive Valve Spring
DescriptionEngine 19318604
Fast Burn Cylinder Head19300955
Valve spring P/N -1612625033
Valve Spring P/N –Retro Conversion Kit19300952
Diameter To +1-.008″1.060″
Diameter Bottom +1-.008″1-270″
Free Height +/-.015″
Installed Height (Ok to shim to proper height1.780″
Pressure Installed Height +1-5 lbs98 lbs.
Open Height1.300″
Open Pressure +1-13 lbs264 lbs.
Coil Bind
Wire DiameterOvate
  1. No vacuum pumps.
  2. Engine’s GM serial number and when applicable, build certification number must be clearly visible to track technical inspectors.
  3. Freedom Motorsports Park Officials reserve the right to inspect, exchange and/or confiscate any GM Crate engine, or other specified engine component. Refusal to surrender an engine or other engine part for inspection, exchange or confiscation, will result in disqualification for the night’s event (loss of points and money),possible suspension from all competition for up to 365 days, and an indefinite probation; penalties apply to both driver and car owner.
  4. ANY VIOLATION OF THE ENGINE RULES AND/OR FACTORY SPECS INSIDE THE SEALING SYSTEM OF THE ENGINE WILL result in disqualification for the nights event (loss of points and money), possible suspension from all competition for up 365 days, and an indefinite probation; penalties apply to both driver and car owner.

After the suspension period, the driver and/or car owner can only compete with an engine equipped with original factory GM sealing bolts or cap seals.

For subsequent violations in regard to any illegal modification to any GM Performance Parts Crate Engine, an indefinite suspension may be issued.

  1. Any violation of the engine rules and/or factory specs outside the original GM twist off bolt heads or cap seals and/or permitted Series seal tags on the engine will result in the driver and car being disqualified from that event (loss of points and money).


1. Rear of engine, bell housing mounting flange surface, must be mounted at least 72″ forward from the centerline of the rear axle. The engine offset must remain within two (“2′) of the centerline of the cross member. The minimum engine height when measured from the ground to the center of the crankshaft is 11”.


  1. One four-barrel carburetor only. The 604 and 602 Chevrolet Performance Circle Track engines perform best with a quality 650 CFM Carburetor. Any 750 CFM or smaller carburetor allowed; must have 1 11/16″ base plate maximum.
  2. All carburetors in competition must retain conventional style floats along with needles and seats. Maximum allowed fuel pressure is 12 psi.
  3. All carburetors must have conventional Holley-style straight or down leg boosters; no exceptions.
  4. Holley 26-342 float bowl vent tube check valves, are highly recommended. Freedom Motorsports park will also allow Willys rollover plates for competition.
  5. Engine must be naturally aspirated.
  6. 604 – May use one carburetor spacer (1″ – one piece with 0.040″ tolerance maximum) and two standard paper gaskets (maximum 0.070″ thick), one gasket between intake to spacer and one gasket between spacer to carburetor.
  7. 602 – May use one carburetor spacer (2″ – one piece with 0.040″ tolerance maximum) and two standard paper gaskets (maximum 0.070″ thick), one gasket between intake spacer and one gasket between spacer to carburetor.
  8. Pipe plugs must remain in manifold heat crossover port on GM 602 crate engines.


  1. Collector-type headers required. Must have four (4) tubes into one (1) collector of a consistent diameter.
  2. NO tri-y headers, merged headers, or square-tube headers allowed.
  3. Headers may dump outside of engine or rear of engine and must not point directly to the ground.
  4. Mufflers are required. Mufflers must have some type of internal noise dampening characteristics, baffles, extruded holes, screen, chambered, etc. Mufflers must be securely attached. External mufflers only.


  1. Any electronic distributor-type ignition system. NO crank trigger, distributor less multi-coil, or magneto ignition system. (Option: GM HEI-styIe, any brand MSD 8365 permitted.) No programmable ignition box. Only one ignition box permitted. Dual pickup distributor permitted; only one pickup in distributor can be utilized.
  2. Competitor may be asked for electronic ignition at any time to be sent for testing and inspection. Failure to relinquish electronic ignition will result in disqualification and “refusal of tech” penalties.


  1. Battery must be securely mounted, shielded, and fastened with positive fasteners and brackets across the top. Battery must not be mounted inside the drivers compartment.
  2. The battery terminals must be insulated and enclosed with a non-conductive material that will prevent contact with any part of the race car should the battery become dislodged from the battery mount.
  3. All battery supports and/or mounts must be secure and braced in two (2) horizontal positions and one (1) vertical position.
  4. No lithium batteries.   
  5. One (1) mandatory battery disconnect switch must be installed on the rear deck, behind the driver seat, in a location that is easily accessible from the “outside” of the race car. The switch must be clearly labeled with off/on direction. The switch must be directly in-line with the NEGATIVE battery cable and be capable of completely disconnecting the NEGATIVE terminal of the battery from the race car. Negative or “ground” wiring connections must not be made anywhere from the battery negative terminal to the input side of the disconnect switch.
  6. All cars must have a starter in working order


  1. All cars must have fuel cells that meet and/or exceed FT3 or SFI 28.3 specifications. The fuel cell must not exceed a 32-gallon capacity.
  2. Fuel cells must be enclosed completely in a steel container, and mounted behind the rear axle, and must also be protected in rear by roll cage tubing mounted securely to the frame or rear bumper. Fuel cell may not be lower than protective tubing. Fuel cell must be completely visible.
  3. All fuel cells must be mounted securely to the frame. behind the rear axle between the rear tires, and a minimum of 4″ ahead of the rear bumper, using a minimum of two bars around the top, bottom, and sides of the fuel cell. The fuel cell must be mounted with a minimum of two (2) .125″ inch thick, 2″ minimum width steel straps. Straps must fully encircle the fuel cell. Fuel cells that are mounted in a square tubing frame will be permitted. A minimum of 7/16″-inch ASTM Grade 8 bolts must be used to mount the fuel cell to the frame.
  4. No part of fuel cell should be lower than the protective tubing. Protective tubing should extend no wider than 6 inches on both sides of fuel cell.
  5. The fuel pickup must be positioned on the top of the fuel cell, and be constructed of steel. The fuel pick-up must have a check valve, and bladders are highly recommended. Bottom feed or vertical side pickups are not permitted. The fuel pickup must have a check valve. Pickups on vertical sides prohibited.
  6. For the purpose of inspection, the drive and/or crew must be prepared to drain fuel upon request for inspection and/or measurement.
  7. Any non oxygenated race or pump gas with a maximum octane of 110 is permitted
  8. Freedom Motorsports Park reserves the right to check fuel anytime.
  9. Mechanical fuel pumps only; cam driven or belt driven style. Regulators permitted. Fuel injection system(s) and/or electrical fuel pumps and/or any type of pressurized fuel system will not be permitted.


Hoosier 26.5/8.0-15 or 27.5/8.0-15 Medium IOC’s or harder

Tires not conforming to manufacturer’s submitted factory benchmark will be deemed illegal.

WARNING: Freedom Motorsports Park strictly forbids any chemical alteration of the ire carcass and/or tread compound such as tire soaking or use of tread “softener”. Freedom Motorsports Park strictly forbids the physical defacement (removal, altering, or covering) of tire sidewall markings in any manner. Failure to comply with this warning could result in premature or catastrophic tire failure and may result in serious injury or death.

Any tire thought to be physically defaced or altered will be confiscated. While tire is in question, all money and points for that driver will be held until a ruling is made final. Any fire deemed to have been physically defaced or altered will be result in disqualification from the event (loss of money and points). All decisions are final.

WHEELS: Maximum 8″ steel production racing wheel may be used. Bead lock wheels may be used.

WHEEL COVERS: Wheel covers: Only steel wheel cover fasteners permitted. It is highly recommended that wheel covers have a minimum of 5 mounting points. However, 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. 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 1/4″ or 5/16″ magnetic steel hex head bolt and an approved fastening (nut assembly) system.

SHOCKS: Only Bilstein shocks may be used in competition at any location on the race car. Only one shock absorber is allowed per wheel. If a shock absorber is used to dampen rear end movement it must be located at minimum 12″ from any part of either rear brake rotor and must be chosen from the following list of shock part numbers.

The only Bilstein shock absorber part numbers that may be utilized are listed below. Note: they may be used on any location on the car.

  • RF 9-3,

RF 7-3,

  • LB 5-3, LB 5030, (These two shock part numbers are the identical shock and valving except for the part number.)
  • RR 3.5-1.5, RR 3.5-1.5, (These two shock part numbers are the identical shock and valving except for the pan number.)
  • LRB 3-6, LRB 3-6 (These two shock part numbers are the identical shock and valving except for the part number.)

I . 5β€”7.5

  • PB 2-6

Shock covers permitted, but must be removed for all technical inspections.

Shocks may not be altered in any way; shock shafts may not be shortened nor strategically bent to seek a handling advantage, gas pressure must not have been altered, and no tampering with the pistons, seals, oil, shock body or valve stack is allowed. All competitors agree to willingly relinquish any one or all shock(s) from any position or all positions on his or her race car that comes into question to tech officials for dyno testing and inspection to determine whether it is, or is not, a legal, unaltered shock.

If, upon dyno testing and inspection, it is determined that the gas pressure, seals, piston, oil, shock tube, rod, or valving has been altered in any way, the shock absorber will be determined illegal and racer will lose all points and monies for the evening.

Freedom Motorsports Park officials reserve the right to technically inspect, and/or confiscate any specified Bilstein sealed shock at any time. Failure to surrender the shock(s) and/or submit the shock(s) for inspection equals disqualification from the night’s event, and possible suspension from all competition for up to 365 days.

Remote Control Suspension Devices: No “in-cockpit driver controlled” suspension devices permitted. No weight jacks etc. of any kind. Any driver using “in-cockpit driver controlled” suspension devices or weight jacks will be disqualified from competition. A competitor found with a remote control suspension device will be disqualified from the event (loss of points and monies) and forfeit the device permanently.

SPRINGS: Only one spring is allowed per wheel. Progressive rate springs at the suspension locations are not allowed.

One additional spring will be allowed for use in a device used to control rear end rotation; this spring may have a progressive rate.

All coil springs must be 100% constructed from steel, no exotic metal alloys or composite spring technology will be allowed.

Leaf springs may be used in the rear and may be composite material or spring steel.

No torsion bars or airbags are allowed.

No spring rubbers are allowed.

Rear springs must be a minimum of 4.5″ i.d. Rear springs may be mounted on a coilover kit and the coilover kit may be made of aluminum or steel, no titanium or composite materials are allowed. Coilover eliminator devices must be all steel in construction.

BUMP STOPS: No bump stops permitted

ROLL CAGE: Minimum tubing thickness .095″. Minimum outside diameter 1.5″. Must be 4 post design with rear upright loop supported with tubing running down to the rear of car.

Top hoop must have 1 crossbar preferably running from right rear to let front. Any of the bars that are utilized for the top portion of the roll cage, included, but not limited to the front and rear hoops, the top hoop, and the uprights, must extend a minimum of 1 “-inch above the driver’s helmet.

All support bars forward of roll cage must be lower than stock hood height. Door bars must be .083″minimum thickness. 3 bars minimum, 4 suggested. Door bars must be welded to roll cage-front and rear and be parallel to frame.

FRAMES: May be cut at a point no further forward than rear of engine block or 1950 or newer. American passenger car factory production frames allowed only. Frames may be cut in rear at a point no further forward than the rear of engine block, both sides. Frames may not be widened or narrowed and must be able to support the roll cage on both sides.

Frame must be full and complete on both sides. Front cross member may be notched for radiator clearance only. Minimum frame height, and body height, must be four (4) inches from ground.


  1. A minimum 1/8″ (.125″) thick magnetic steel intrusion plate on the driver’s side door bars is mandatory.
  2. Approved installation:
    1. Welded plates- Individual plates between door bars are permitted but must be weld around the perimeter of each opening. Minimum area covered is 16 inches by 26 inches.
    2. A minimum of 16″ x 26″ plate bolted to fabricated 118″ (.125″) magnetic steel tabs, welded securely to the chassis, using a minimum of eight (8) x 318″ Allen button head bolts. A minimum of three (3) fabricated 1/8″ (.125″) magnetic steel tabs and 3/8″ Allen button head bolts required across top of the intrusion plate, a minimum of three (3) fabricated 1/8″ (. 125″) magnetic steel tabs and 3/8″ Allen button head bolts required across the bottom of the plate, and one (1) fabricated 118″ (. 125″) magnetic steel tabs and 318″ Allen button head bolt in each in the middle front and middle rear of intrusion plate.

A minimum of 16″ x 26″ plate bolted to a minimum of six (6) approved-design door bar clamps using the included 12 x 1/2″ Allen button head bolts per the manufacturers specification. A minimum of three (3) approved-design door bar clamps and the included six (6) x 1/2″ Allen button head bolts required across top of the intrusion plate and three (3) approved-design door bar clamps and included six (6) x 1/2″ Allen button head bolts required across bottom of intrusion plate.

WHEELBASE: Minimum 108″, maximum 112″. No tolerance.

FRONT SUSPENSION: Steel aftermarket parts may be used as stock components. This includes lower tubular A-frames. Extended lower A-frames on right front only. Stock passenger car spindles or three (3)-piece spindle allowed. No tubular or fabricated spindles allowed. Tubular type upper and lower A-frames permitted. Lower control arms cannot be moved, (exception: may weld shock mount on lower control arm). Upper A-frames may be moved and have aluminum cross shafts. Coil springs minimum 4-1/2″ diameter only (no coil overs) and must be mounted in stock position. No coilover eliminators may be used. (Mono balls will be accepted.)

A) The maximum overall width of the car, front and/or rear, shall not exceed 78″ inches when measured from the outside of the tire tread on both sides of the vehicle. A maximum one (1″) inch spacer between the hub and wheel will be permitted. Steel and/or aluminum spacers will be permitted, provided the overall tread width of the vehicle does not exceed 78″-inches.

STEERING: Front steer type frames must have steering box mounted on let frame rail ahead of front cross member. Rear steer frames must have steering box mounted behind cross member on let frame rail. Power steering with a steering quickener is permitted. No rack and pinion steering. Stock type steering boxes only. All steering linkage must be steel components. Only one (1) power steering pump allowed. It is required that all cars have a collapsible steering shaft. All cars must be equipped with a quick-release-type steering wheel that is a full circle. Electronic steering or electronic steering components will not be permitted.

REAR END: Any passenger car or truck type rear end permitted. Quick change allowed with steel tubes (NO SLIP TYPE DIFFERENTIALS). NO ALUMINUM tubes with STEEL sleeves.

REAR SUSPENSION: May be coil spring (minimum 5″) diameter or steel leaf springs. Coil-over eliminators or steel/aluminum coil-over kits may be used with coil springs. Lowering blocks (aluminum or steel) may be used with leaf springs. No aluminum birdcages, brake floaters or trailing arm mounts allowed. Panhard bar, panhard brackets and trailing arms may be steel or aluminum. One (1) spring per wheel.

Radius rods must be attached to the frame brackets and to the birdcages using metal spherical rod ends or mono ball type bearings. Non-metallic bearings and/or bushings will not be permitted. All mounting holes for attaching radius rods must be round and properly fit fastener being used to prevent movement.

Swing arm and/or Z-Link suspension are permitted. The shock on the swing arm or z-link rear suspension must be mounted to the bird cage or bottom rod. Top and bottom solid rod links must be mounted on heims and run in the opposite direction of bird cage.

A) The maximum overall width of the car, front and/or rear, shall not exceed 78″ inches when measured from the outside of the tire tread on both sides of the vehicle. A maximum one (1″) inch spacer between the hub and wheel will be permitted. Steel and/or aluminum spacers will be permitted, provided the overall tread width of the vehicle does not exceed 78″-inches.

WEIGHT: All GM 604 cars must weigh 2400 lbs and GM 602 cars 2250 lbs with the driver after the race.

Weight must be painted white and have car number on it. Weights up to 50 lbs. must be positively fastened by two (2) 1/2-inch, minimum grade 5 bolts with a minimum of two (2) weight clamps. Threaded rods will not be permitted. No weights added in driver compartment or outside of body. Weight may not be attached to rear bumper. Penalty for losing weight on race track is disqualification.

DRIVESHAFT: Must have a protection loop completely around. Loop must be .25″ thick x 2″ wide steel minimum and mounted no more than 6″ back from U-joint in driveshaft. Drive shaft must be steel or carbon fiber.

TRANSMISSION: Must have forward and reverse gears and be able to shit to forward or reverse with engine running. Bert and Brinn type transmissions are permitted. Stock clutch type transmissions must have scattershield or blow proof bell housing. Automatics must be stock OEM cases and bell housings.

RADIATORS: May be aluminum, steel, or brass and must fit under hood line and be located in front of engine fan.

FAN: Engine must be equipped with a mechanical fan; steel, aluminum or plastic. No electric fan.

WATER PUMP: Cast or aluminum permitted. No electric water pump.

BRAKES: Must have brakes on all 4 wheels. Brake shut offs are permitted. Calipers may be steel or aluminum single piston OEM style only, steel rotors only.

BODIES: (Refer to drawing at bottom of rules.) A.) 12″min 24″ max

  1. The maximum roof height of 54″ inches. 5″ max slope.
  2. The sides of the engine compartment will remain open. Any side panels in the engine compartment area will not be permitted. A six-inch drop on either side of the hood will be permitted and it must be enclosed at the rear of the hood. Hood must slope towards the nose of the car (No Reverse Rake to the Hood).
  1. The top of the doors must not extend forward of the rear engine plate. The bottom of the doors may extend a maximum of 12″ inches past the motor plate toward the front of the vehicle.
  2. Front roof post width 16″max at the bottom. Roof post at the bottom rear must then go upward at a 90 degree angle. The front roof post must be in a straight line from top to bottom and must come down to the deck with a max 2″ step (P).

l.) Wheelbase: Minimum 108″, maximum 112″.

  1. Door panel 32″max 26″min.
  2. 72″ max.
  3. 12″-18″ door opening height.
  4. With a level, must have no more than 2″ clearance at rear roof, and 5″ at top front. Original roof line of vehicle must be maintained with a maximum of five (5) inches of slope measured with a level from highest point minus the stiffener to lowest point. No more than one-half (1/2) inch stiffener allowed at the rear of the roof.
  5. Maximum deck length 120″.
  6. Rear comer panel length from center of hub to back 48″ max, 34″ min.
  7. 7″ max at top rear, gradual slope from roof to this point when using sail panel as spoiler side with max spoiler height of 5″. The spoiler may be fabricated from lexan or aluminum. The Sail panels must be the same design and size on each side (Both open with same opening dimension or both closed). Maximum bow of sail panel is 4″. 8″ max spoiler allowed if the sail panel remains separate from the spoiler sides. When using 8″ spoiler, sail panels can be no higher than 4″ from deck at end point, spoiler supports shall be same height as spoiler at rear and 4″ tall max at front and 24″ min total length, sail panel may not be farther back than leading edge of spoiler support on 8″ spoilers. Maximum spoiler width will be 68″ on 5″ or 8″ spoilers.
  8. Interior decks must be flat from side to side. Interior decks may have a up to a total of 6″ of “rake” from the most forward part of the deck to the most rearward part of the deck as described below. Interior deck from the rear of the seat forward may be fiat or have up to 3″ of rake. The interior deck from the rear of the seat to the rear of the car cannot exceed 3″ of rake regardless of how much rake the front portion measures. The rake of the rear portion of the interior deck must be in a straight flat line from the rear of the seat to the rear of the car.
  9. Maximum height of 38″ inches. The top of the interior must be flush with the top of door; maximum drop of deck 2″, no tolerance.
  10. Maximum width of nose at any point will be 45″. The nose piece shall not be attached any further back than the radiator. The MD3 modified nose and Dominator nose will be legal. All aluminum fabricated nose pieces can have a 2 112″ lip on each side of nose piece (length of the nose). The nose piece must have a minimum of four (4″) inches from the ground to the bottom edge of the nose piece. Noses must be fiat from top to bottom (No curving of nosepiece).
  11. Hood max width is 68″ max 24″min. No narrower than radiator.
  12. The maximum roof width will be 52″ inches wit) a minimum of 44″ inches.
  13. The maximum roof length will be 57″ inches with a minimum roof length of 40″ inches
  14. On the “left side only*’ the rear of the bottom of the door may flare out six (6″) inches for tire clearance; beyond the required body width of 72”. The bottom of the fare must be curved and rounded not pointed in any fashion. No wheel skirts of any type will be allowed.

Rear wheel openings must remain same on both sides of car and maintain a minimum 2″ wheel clearance.

  1. The maximum body width at the bodies widest part will be 72″; 78″ width including flare. The maximum deck width will be 68″.

A stone shield for remote oil filters or transmission is allowed, 24″ x 24″ maximum located near rear engine plate.

FRONT BUMPER: Must be mounted to end of frame, with bottom loop parallel to the ground. Minimum 1-1/4″ tubing must be used. Rear bumper may be tubing or square stock and must protect fuel cell. Center of bumpers must be at least 18″ from ground. No sharp edges. Bumper cannot extend more than 42″ from center of front wheel. Farthest point of nose/bumper cannot be no more than 42″ from center of front wheel hub. Bumper must be leading edge of the car.

NERF BARS: Must be inside of line from rear tire to front tire with no sharp edges. There is no tolerance.

WINDOWS: Drivers side window and passenger side window must remain open except for support angles in roof pillar openings. Support angles cannot extend past the front roof line. Roof pillars must be in place. Window nets are recommended. Also a screen is HIGHLY recommended in cockpit to deflect debris from driver.

EXOTIC MATERIALS: NOTE: All exotic materials are illegal, which includes titanium, tungsten and/or carbon fiber. EXCEPTION: carbon fiber driveshafts will be permitted for safety purposes as well carbon fiber seats provided they meet the 39.2 specifications. Magnesium rear end center section, bells, and rear cover will be permitted. No other magnesium parts will be permitted

MISCELLANEOUS: No radios (transmitting or listening devices) or mirrors permitted. Mirrored finished stainless or other materials are not permitted, if used for the same purpose as a mirror. No car will qualify without inspector approval. All race cars are subject to inspection by officials at any time.


NO radios other than one-way communications between Track and/or Series Officials. One-way driver radio is mandatory at all events. Transponders are mandatory

  1. Seats must be “Full Containment’ style constructed of aluminum to the general design specifications of current industry standards, (SFI 39.2 highly recommended). Design shall include comprehensive head surround, shoulder and torso support system, energy impact foam, and removable head foam. Consult with your seat manufacturer for questions and recommendations regarding your seat safety system.

Seats manufactured using carbon fiber or composite materials must meet SFI 39.2 specifications.

Up-fitting an existing seat with bolt-on kits will be permitted with a seat manufacturer-produced kit and an acceptable base seat approved by the seat manufacturer. Consult with your seat manufacturer for recommendations regarding your current seat. If Let Head Surround does not exceed 7 inches from the back of the headrest, a left side seat net meeting SFI specifications is required.

  1. All areas surrounding the head should have padding.


  1. Sharp and/or protruding edges in and around the cockpit will not be permitted.
  2. Windshield screens should be a minimum thickness of 0.090 inch and should be securely fastened to the roll cage.
  3. Driver’s side window nets are highly recommended.
  4. A clearly marked electrical engine shut off switch within the reach of the driver.
  5. Roll bar padding mandatory. Other cockpit padding, knee and steering pads recommended. All padding must be fire resistant.
  6. Driveline U-Joint scatter shields are recommended.
  7. It is highly recommended cars be equipped with 10-1b fire suppression system meeting SFI 17.1 requirements.
  8. It is highly recommended all teams must have a fire extinguisher in the rear of their transporter with the car number clearly visible on the extinguisher. It is highly recommended the fire extinguisher be a minimum of 201bs and is recommended to FFF type chemical and/or Dupont FE-36 and/or equivalent.