April 24, 2014

V-8 Thunder Stocks

2013 Thunderstock/V-8 Warrior Rules


  1. The Hendry County Motorsports Park officials may inspect any car and equipment at anytime for compliance.  All cars must have an extensive safety inspection each season before they race.  In addition, there will be a routine safety inspection every week before the racing event.
  2. All required safety equipment and apparel must be in use while the car is on the track.
  3. Racing helmet with minimum Snell 95 rating.  Neck brace or hans device recommended.
  4. Fire suit with SFI minimum rating of “I”.  No holes or torn fire suits allowed.
  5. Fire resistant gloves, shoes, and socks must be worn at all times when car is on track.
  6. A minimum four-point roll cage.  Must be steel pipe or tubing, a minimum of 1 1/2” (1.50”) outside diameter with minimum of 0.095” wall thickness. No square tubing or galvanized pipe allowed. No exceptions.  Roll bar padding required around driver.  Unibody cars may be tied together not to exceed 10 inches “overlap at joint front and rear.”  No double frame.  All rear and front roll cage tubes must sit on original frame.  Front and rear down bars allowed.
  7. An engine kill switch must be mounted in the window net area and easily accessible by the driver and from outside of the car.  The switch must be clearly marked “Ignition Switch” and show on and off position.
  8. All cars must have a fire extinguisher minimum 2 lbs. securely mounted within easy reach of the driver.
  9. A single quick release 4 point harness (minimum 3” belts) dated 2007 or newer is required in all vehicles.  All required belts must be in use anytime the car is on the track.  Racing harness must be attached to the roll cage.
  10. Window nets are required on the driver’s side of the car and must be securely mounted.  Nets must latch at the top and be operational from inside and outside of car.  Drivers must be able to exit both sides of the car.
  11. Aluminum racing seats are mandatory.
  12. Drive shaft must be painted white and include the car number.  Drive shaft loop will be a 5” diameter steel loop.  1” wide and ¼” thick.  It must be securely mounted to the frame 12” from the front universal.  Must have one on rear drive shaft.
  13. Battery shall be secured to frame of car and must be encased.
  14. All lead ballast must be painted with car number and secured with one ½” bolt per 50 lbs.  It is your responsibility to make sure your ballast stays in your car for everyone’s safety.  Penalty weights must be painted red or orange.  If weight falls off of your car on the track at any time you are immediately disqualified from the event.
  15. Throttle toe strap is mandatory.  Throttle linkage must have two return springs.
  16. All cars must have front and rear hook ups for towing.
  17. All cars must have a radiator over flow can.  Water only for coolant.
  18. All standard transmission must have a scatter shield.
  19. If it’s not stated in the rules it doesn’t mean it’s approved.  Please consult with tech-man for approval.  All teach decisions are final.  The track reserves the right to add weight to any driver in the fairness of competition.
  20. You need to understand all safety requirements. Track Management as well as the Tech Man reserves the right to disqualify any car and/or driver that does not comply with all safety requirements.  Competition will not and cannot come before safety.


  1. Any 1970 or newer American made production 2 or 4 door sedan. The minimum wheelbase allowed is 101” (1” tolerance) (centerline of front wheels to centerline of rear wheels.  (This cannot be altered).  Weight 3200 lbs. with original driver after completion of the race.
  2. No subcompact cars.  No foreign convertibles, trucks, four wheel drive or front wheel drive cars allowed. The only exception to the truck rule is the DeSoto Speedway and Charlotte County Speedway style Cowboy Cadillacs, which will be evaluated per circumstance.
  3. No chopping, shortening, or channeling.  Both sides must be the same.
  4. In case a frame issue comes up from a wreck, get with tech to see how or if the chassis is capable to be put back to be legal.


  1. Completely stock for year make and model.  Doors may be replaced with 18 gauge (.047”) steel.
  2. Car body must be strictly stock.  No modifications or alterations of any kind unless outlined below. No flaring of bodies.
  3. Removal of interior parts which can be removed with hand tools are okay.  No cutting of any panels allowed.  Any interior part that is flammable must be removed.
  4. Left and right passenger doors may be gutted for roll bars.  Minimum of 4 bars on driver’s side.  Three bars on passenger side.
  5. All exterior trim must be removed.
  6. Hood must have hood pins in front, hinges or pins at rear.  May have hole in hood for air cleaner (must be boxed in on all four sides).  Hood must close in original stock position.
  7. Inner front fender panels may be removed.
  8. Complete stock floor pan must be retained.  No sheet metal floor pan.  In case of repairing damaged, rusting or rotted floor pan you must use same gauge or heavier of stock floor pan.
  9. Fenders may be trimmed for tire clearance.
  10. Stock factory brake pedal must be mounted in original factory stock location.
  11. The window channel on the front doors of a sedan style body may be removed.  All other window posts must remain as placed by manufacturer in original location.
  12. All glass and plastic must be removed.  Plastic stock appearing noses only.  No slope or late model style noses.
  13. No side windows of any kind.
  14. Factory spoilers and side skirts are okay. 6” by 60” maximum aftermarket spoiler.  No side spoilers.  Aftermarket side skirts must meet ride height rule.
  15. Bumpers may be steel tubing with no sharp edges, corners must be rounded.  Pipe may not be larger than 1 3/4” by .095 thickness.
  16. Steel tubing may be used to brace or protect radiator.  One hoop bar over radiator attached to frame horns may be used.  It may be braced with bars angled to frame horns.
  17. Wire screen minimum 1” by 1” with three ½” bars must be installed in front of driver in place of windshield.  Screen replaces entire original windshield.
  18. Inner skin of hood and trunk lid may be gutted.
  19. Floor of trunk area may be removed for fuel cell installation.
  20. May have rub rails (one per side only) made of 1” round or square tubing, ends must be capped at a 45 degree angle.
  21. Trunk and fuel cell area must be tightly sealed from the driver compartment.
  22. No decking allowed.  Rear spoiler, from deck height to top of spoiler must not exceed 6” at any angle.
  23. Window net must unhook from the top.
  24. Battery must be self-contained and securely mounted in battery tray.
  25. No two-way radios.
  26. Dashboards are required and may be made of steel or aluminum.
  27. All pedals must remain in stock location, with the exceptions of clutch pedal and slave cylinder on cars converted to standard transmission.  That had no manual clutch.
  28. Stock OEM body parts are allowed, may be stock replacement aftermarket.  No flat panels or aluminum panels.
  29. All sheet metal, roof height, firewalls, floor pans, and body mounts must remain in stock location and dimensions.


Chassis and Suspension

  1. Aftermarket stock mount springs are okay.  No composite leaf springs.  Rear springs must fit in stock location and buckets.  Ride height 5”.   One shock per wheel.  Shocks must be in factory stock location only.  No coil over.
  2. Car must sit level with a minimum height of 5” of clearance from frame to ground, as this will be checked on a regular basis.
  3. May use non-threaded, non-adjustable spring buckets in front only.  Must be same height.  No tolerance.
  4. Camber may be adjusted within limits of stock length bolts.
  5. Sway bar may be removed.  If the sway bar remains on car it must be stock for make and model.  No heating or tweaking.  No adjusting on spacing of bar.
  6. Stock replacement shocks: no extensions, steel body, non-adjustable factory stock locations. Must be only, must be steel, and factory mounting.  Can run 50/50 steel body racing shock.  Split valve shocks are OK.  No adjustable shocks.  No take apart revalveable shocks or the equivalent.
  7. Shock claimer rule, $60 per shock and must forfeit own shocks.  Driver claiming shock(s) must have finished in top 5 and be on the lead lap.  Procedure for shock claimer is the same as the protest procedure listed at the end of the rules.
  8. Steering components must be stock for make, year, and model of car.  Quick release allowed.  No quick steer.  Aftermarket power steering pump allowed.



  1. Stock for make and model.  GM350, Chrysler360, Ford351 MAX.  Metric cars will be allowed 350 cubic inches.  Engine location in stock position for make and model in factory mounts.
  2. Engines must remain strictly stock as produced by manufacturer.  No modifications of any kind unless outlined herein.
  3. No high performance engine of any kind.  No high performance parts of any kind.  No air boxes.
  4. Heads 70cc minimum.
  5. 3 angle valve job is okay.  Final cut no greater than 75 degrees.
  6. Bronze guides okay.
  7. 1.270” O.D. maximum valve spring diameter.  OEM replacement valve spring retainers are okay.  No light weight, aluminum, or titanium.
  8. Stainless OEM stock replacement valves.  Neck downs and swirl polished are okay.
  9. Screw in studs, guide plates, and polylocks are okay.
  10. No grinding on any engine part or component.
  11. Maximum overbore allowed is .060 + .010 for clearance.
  12. Optional: pulleys, oil pan and engine fasteners.  Aftermarket or racing valve covers and oil pans are permitted.  Aftermarket pulleys permitted.  No fluid dampeners or no high performance fuel pumps.
  13. Aluminum radiator and water pumps are okay.
  14. Cam lift: GM .390/.410, Ford .425/.450, Dodge .390/.420, Pontiac .388/.424.  Camshaft may be degreed.  No gear drives.
  15. Carbureted or fuel injection allowed.  Factory stock fuel injection systems only.  No modifications or high performance parts allowed.  All electronic brain boxes or components must be stock and factory sealed.  This shall be strictly enforced and a factory stock fuel injection system that is suspected of being tampered with or altered is subject to be impounded and shipped to another location for additional tech.
  16. Factory OEM stock 2 or 4 Barrel Quadrajet (choke plate may be removed). Side fuel line only or Holley 4412 500 cfm with Mr Gasket PT#1929 adapter. May remove choke plate and shaft, change jets, power valve and accelerator pump. No secondary metering block.
  17. Ford may use Holley 1850.  May remove choke plate and shaft, change jets, power valve and accelerator pump.  No secondary metering block.
  18. Lifter Valley baffle and screens are okay.
  19. OEM four eyebrow flat top pistons are okay.
  20. Any air cleaner, steel top.
  21. Aftermarket power steering pump and engine cooler are okay.
  22. All internal components cannot exceed factory OEM specs.  It is your responsibility to provide factory data to back up your specs and not the tracks.
  23. Moroso Kit #62610 and #62630 are the only solid motor mounts allowed and must be mounted in stock location. May chain, strap, or use OEM replacement urethane motor mounts.
  24. Cast iron intake only.  No marine intakes.
  25. Z/28 flywheel is okay.  Minimum weight is 14 lbs.

Drive Train

  1. Rear end must be strictly stock for make and model.  Welded rear end is okay.  Mini spool is okay.  C-clip eliminator kit is allowed.  No lockers.
  2. May use aftermarket OEM replacement axles.
  3. Transmission must have all working gears.  Factory type mounts.  Automatics must run 11” stock torque convertor, no shift kits, no dummy convertors, must be stock.
  4. Engine location in stock position for make and model in factory mounts.
  5. Solid hub clutch discs are okay.  Must be full circle.
  6. No lightweight clutch assemblies.


  1. 12 volt battery fired ignition only.
  2. OEM points or HEI distributor only.
  3. May use billet distributor housing.
  4. Distributor may be locked.
  5. No printed circuit board modules.
  6. Alternator is okay.


  1. Stock OEM cast iron manifold only.  Exhaust pipe must exit behind the driver and no larger than 2 ½” all the way.
  2. No center dump exhaust manifold.
  3. Mufflers are okay.
  4. No headers, not even if they were factory.  NONE!!!  No LS1 manifolds and no truck manifolds.


  1. No additives allowed.
  2. Pump or racing fuel is allowed.
  3. Maximum of 22 gallon fuel cell.
  4. Cutting the trunk for the fuel cell is permitted.
  5. No electric fuel pumps.
  6. Fuel cell must be in 12 gauge can and centered.
  7. Must be securely mounted with at least two 2” by 1/8” steel straps.


  1. Stock factory OEM 4 wheel working brakes only (calibers must be the same size).
  2. No brake bias devices of any kind.
  3. May remove OEM proportioning valve.
  4. No aftermarket brake pedals.

Wheels and Tires

  1. Maximum 8” wheels.
  2. Minimum 7/16” studs with 1” lug nuts on all 4 wheels.
  3. 3 steel wheels 15 by 7 or 15 by 8.  All wheels the same size except right front.  Offset 3” or 4”, but all must be the same size except for the right front.
  4. No wheel spacers.
  5. Tires must be DOT approved.  Radial 70 series only.  All tires must be same size except right front.  No LT or purpose built snow tires or any tire with mountain or snowflake symbol.  No recaps.  No racing tires disguised with DOT stamp.
  6. Tires must not exceed 2” from fender wells, except right front.
  7. Right front wheel only 8” or 10” wheel with no wide fives.
  8. May run right rear bead lock only!!!
  9. Goodyear, Hoosier, or American Racer 26.5 by 8 by 15 series tire on right front only.  Medium compound tire may be used.
  10. Anything not mentioned must remain stock.



It is stated in the rules above what you can do to your car.  Anything else will not be allowed!!!  In other words, if it is not stated in the rules then it is not approved.  Please consult tech-man for approval.  All tech decisions are final and a disqualification means ALL money, prizes, and points are forfeited.

No grinding or defacing of any casting numbers.  Any motor parts with missing or altered casting numbers are illegal regardless of the reason.  To pull and inspect a carburetor is $100. To pull a head, the protest will be $150.  To pull a camshaft will be $200.  To pull a motor out to check the bottom end will be $500 (of which $100 will go to the tech inspector).  Should the car be found illegal, the money minus the $100 on a motor being pulled will go back to the protesting party.  Should the car be found legal then the money minus the $100 should it be a motor pull will go to the car being protested.

A proper protest will be completed as follows:

The protest has to be done by the driver on the front straightaway immediately after the feature and only by cars finishing in the top five and on the Lead Lap.  The driver must notify the flagman or the front straightaway track official, which will then alert the car being protested.  The car will then be impounded in tech and the protesting party will have 10 minutes to present the money as stated above for what is being protested.  This must be presented in the form of cash, money order, or cashier check.  No personal checks will be accepted.  The track officials, and only the track officials, shall determine when the 10 minutes will begin and the funds must be presented to the tech man.