Thunder Stock - 2012 - Gillette Thunder Speedway


The GSCRA Head Tech person has the final say in the interpretation of a rule. This say will be final. If an item is not stated as allowed, it is deemed to be disallowed.

Rule 1- Car Type:
    1. Any American made car (no trucks) with a factory wheel base of 108.
    2. No Convertibles allowed.
    3. No four wheel drive or front wheel drive cars allowed.

Rule 2- Bodies:
    1. Must be steel and remain strictly stock.
    2. Hoods may be trimmed and liner removed. No aftermarket.
    3. No cutting or trimming of any body panel is allowed, except for bar and roll cage
    4. All glass and chrome must be removed. This includes any exterior chrome, moldings,
        emblems and door handles, bumper guards and plastic grills. Fiberglass parts that may
        be subject to being broken must be removed.
    5. All flammable materials must be removed from inside the car.
    6. Steering shaft must remain in stock location. A removable steering wheel is allowed
        and highly encourage. A solid shaft must remain the same length as a stock shaft.
    7. Bolt on accessories in the engine compartment may be removed. Bolt on accessories in
        the driver’s compartment will be removed.
    8. Full uncut floorboard must extend from the front firewall to the new bumper. Must   
        remain uncut, no cutting of trunk floor.
    9. Inner front fender wells may be removed. Front and rear fenders may be trimmed for
        tire clearance. All sharp edges must be rolled or covered.
    10. Doors may be welded or bolted shut.  If bolted shut a minimum 1 1/2 strap with 2
        bolts on each end must be used.
    11. Bumpers may be welded to help prevent loss. Each end must be turned in to prevent
        hooking another car. Bumpers must have OEM mounts, no after market or extra
        materials allowed.
    12. One bar no longer than 2” O.K. for radiator protection is allowed. Bar must be
        horizontal to the frame and behind the sheet metal. Two vertical bars will be allowed
        on each side of the radiator for support of this hoop.  Bars can go back to the firewall
        but not to go through, must stay in front of firewall.
    13. Bars for leg protection are allowed.
    14. Uni-body cars must have a plate minimum 1/8” thick X 6” square welded under the
        main cage legs. Plate may be securely welded to main structure of uni-body or be
        bolted through the structure with a matching plate on the underside.
    15. Uni-bodies tied together with 2 X 1 tubes.
    16. No tinning in passenger compartment

Rule 3 - Suspension
    1. No modifying of suspension.
    2. All suspension parts must remain absolutely stock for make, model and year of car. No
        spacers aftermarket parts of any kind or hold down chains allowed.
    3. Rubber suspension bushing only. No polyurethane, plastic, steel, aluminum, brass or
        any or the material not OEM for the model used.
    4. Stock OEM spring only. No air shocks or shocks with helper springs allowed. No
        aluminum suspension components allowed.
    5. Shocks or springs can be claimed for $ 10.00.
    6. Spring or shock claim must be paid in full before the start of the main event to pit
        steward. Shocks and springs claimed will be exchanged after completion of the main

Rule 4 -Transmission and Rear Ends
    1. All drive train components shall be strictly unmodified stock OEM parts.
    2. Stock passenger car type transmission for make and model of car.
    3. Stock passenger car type rear end only.
    4. Rear end and transmission must match family of car used. Ford for a Ford, Chevy for a
    5. All cars must have forward and reverse working gears.
    6. Automatic transmissions only.
    7. Automatic transmissions will have a stock working 11” torque converter. An add-on oil
        cooler is allowed, but must be shielded from the driver if located near the driver’s    
        compartment. No material may be added to torque converter to achieve and to equal
        11” measurement. ALL converter shall contain 4 quarts of fluid. Although a quick oil
        detection plug is not required at this time. Scatter shields optional but not required.
    8. Rear ends may have spider gears welded or posi-traction.
    9. No aluminum components allowed.
    10. No spools allowed.
    11. Rear end gears may be run no deeper than 4.10 gearing.

Rule 5- Engines
    1. No high performance engines allowed.
    2. All engine components must be strictly stock and stock OEM production availability for
        make and model of car.
    3. Engines may be interchanged within their family line only if no medications of any kind
        are required and all mounting remains in stock placement.
    4. Up to .60 over bore is allowed.
    5. Pistons shall be a stock flat top or less. No dome pistons allowed. 9.5 too 1
    6. No aluminum manifolds, stock or otherwise.
    7. Stock exhaust manifolds only, no center dump Chevy allowed. Exhaust must extend
        past the driver and remain under floor board.
    8. ABSOLUTELY NO machining, milling, or modifying of cylinder heads, intake manifolds,
        exhaust manifolds, carburetors of any portion of the cylinder block. NOTE: Minor milling
        of the head in the case of an engine overheating problem which causes a slight warp
        will be allowed. The Thunder Class Rep must be told of the minor milling before it takes
        place. The class rep will have the right to be present or to inspect the work done at
        his/her discretion. No angle milling of heads allowed.
    9. All engine and components except camshaft and lifters must remain and be OEM
        factory production available for engine to be legal. 350 Chevy must run 350 crank and
        350 rods.
    10. All cars must have a hydraulic flat tappet cam with a .450 gross valve lift or less with
        the following exception: Ford 429 intake and .486 exhaust gross valve lift and a Ford
        460 which is a .437 intake and .481 exhaust gross valve lift. No roller cams, no roller
        lifters or no roller rockers stock or otherwise. It will be the driver’s responsibility to
        prove the legality of his/her cam.
    11. No electric fuel pumps, stock mechanical only.
    12. Stock OEM ignition only.
    13. No out of ordinary add on equipment allowed.
    14. Carburetion will be limited to one (1) stock Holly 500 CEM 2-barrel, part number
        4412, with a 1/11/16” throttle bore. No grinding or polishing of any kind allowed. All
        carburetor components must be for a 500 Holley. no milling or grinding of throttle shaft
        allowed. Shaft must stay round. Choke can be removed but not the air horn. Must have
        stock measurements. Maximum thickness of gaskets and adapter plat will be 1 3/8”.
        Stock aluminum adapters only. No high performance adapters allowed. Spacer opening
        must be perpendicular to the bar of carburetor. No adjustable or slider adapters.
    15. Stock two or four-barrel intake manifolds only.
    16. Maximum of one fixed, no-adjustable space allowed on four-barrel intake. Maximum
        thickness of 1 ¼”. No Marine or van manifolds.
    17. No heads allowed that are listed as high performance in the interchange manuals.
    18. Chevy heads: NO casting numbers ending with 040, 041, 186, 291, 191, 370, 432,
        461, 461 X 462. No bow tie, no SO, no w-2 heads. No 202 intake valves on Chevy or
        Chrysler. No air flow devices allowed below carburetor.
    19. After market oil pan is acceptable, not required.
    20. The engine must remain in its stock location. You may NOT relocate the motor
    21. All cars must run restrictor plate issued by track.  No plate no race.
    22. Aluminum or aftermarket pulleys allowed.

    1. Car must have a four-point roll cage.
    2. Four bars required on drivers side.
    3. Three bar minimum on right side.
    4. 1 ½” x .095 minimum mild steel tubing on main roll cage.
    5. A competition safety harness with 3” belts mounted in five points required. Belts must
        meet the required safe age limit for use. Belts must be fastened to a point on the
        frame or cage. These need to be replaced every 3 years.
    6. Race type seats required. No fiberglass
    7. Must have window net. Spring loaded only.
    8. Must have a screen and/or bars in front of driver.
    9. Roll bar padding will be used where the drivers head or arms make contact with the
        roll bars. This includes halo and vertical cage bars.
    10. Drive shafts shall be painted white.
    11. Drive shaft must have a safety hoop 360 degree around.
    12. A plate on drivers door required with 1/8 minimum thickness.  Must cover from top to
        bottom bar.

    1. Pump gas only, 92 octane or less.
    2. No additives, alcohol, or exotic octane boosters allowed.
    3. Fuel may be tested at any time.
    4. No adjustable fuel tanks allowed.
    5. Racing fuel cell required. Fuel cell must be enclosed in approved metal or plastic box.
        Plastic fuel bladders will not be allowed to be bolted down by themselves.
    6. Protection bar around fuel cell required. Bar must protect rear side of tank from
        collision and extend below the bottom level of the tank.
    7. Fuel system must meet safety requirements at all times.

    1. Approved steel safety wheels or racing wheels only. No stock rims allowed.
    2. Passenger car tread only.
    3. No tires known or judged to be manufactured for off highway or racing use is allowed.
    4. No tire is to be ground on, cut on, or modified in any way.
    5. No aggressive tread design is allowed. All season tread allowed. No mud or snow tires
    6. Maximum tire size is p235/70 R15 or up to series tires in actual passenger car type tire.
        Any hoosier tire allowed no modifying or grinding of tires allowed.
    7. Maximum rim width 8 inches.
    8. Wheel studs will be required to be ½” dia. On the front and rear on the right side of the
    9. No welding on rims.

    1. 3500 lbs. Minimum, including the driver.
    2. All weight, if added, must be mounted with a minimum of two ½” bolts. Weights must
        be painted white with car number written on them.
    3. Weight cannot be mounted in driver’s compartment.
    4. No unshielded batteries in driver’s compartment.

    1. When a driver wins 6 main events during the season, his motor will be automatically
        torn down for inspection and every 6th main event win thereafter.
    2. Failure to pass inspection will result in a $ 500.00 fine to the driver and a 30 day
        suspension for that driver.
    3. It is the driver’s responsibility to prove to the tech inspector he/she is legal.
    4. Thunder Stock drivers will fall under the GSCRA rules for protesting a mechanical part
        they deem an unfair advantage.
    5. The driver is responsible to get in touch with the class rep to determine the legality of
    6. Fuel may be exchanged among drivers at anytime.

    1. Protest fees: $100.00 cash for either the top end or the bottom end. $200.00 cash for
        both. You must write down what you want checked.
    2. The only person that shall be present at a teardown shall be the following: the driver of
        the car in question, the owner of the car in question, up to two pit crew persons of the
        car in question, the protesting driver, the GSCRA Thunder Stock Class Rep, the GSCRA
        official, the GSCRA TECH Inspector, and any helper requested by the GSCRA Tech
        inspector. Any other person not listed must be authorized by the GSCRA Tech
        inspector. Any other driver not involved with the car or GSCRA members will be fined a
        minimum of $50.00, if you show up at a tear down.
1. To claim a motor you must present dollars in cash to the scale official within five (5)
        minutes after the race. Claimer must have in writing what he is claiming.
    2. The owner/driver are the only ones who can claim a motor.
    3. To claim a motor you will present $ 1,200.00 cash or if the engines are compatible
    4. The claimer must pull into the claim area.
    5. All external parts on any claim will be removed. Long blocks include intake manifold
        and tin.
    6. You cannot claim or be claimed if you are racing at the track for the first time. You can
        only claim or be claimed twice a year.