Factory Stock Rules 2025

 

2025 FACTORY STOCK

Any Chrysler, Ford or GM car that was, or is, mass produced for the U.S MANDATORY: All drivers and cars MUST HAVE Raceceivers and Transponders Weight: 3200 lbs.

 Engine Option #1:

1.Quicksilver 357, GM 602 sealed crate engine

  1. Any altering of any bolts or suspicious seals will be disqualified until proven legal
  2. GASOLINE 110 MAX
  3. NO engine setback allowed.

Engine Option #2:

  1. Stock steel small block must not exceed: a. Chevy 362 cu in max,
  2. Dodge 368 cu in. max,
  3. Ford 363 cu in max.
  4. Stock bore and stroke and all casting numbers must be visible
  5. No gear/belt timing components allowed
  6. Solid or hydraulic lifters with .480 max lift @ top of valve a. NO Rollers b. NO Mushroom c. NO Ceramic lifters
  7. Flat top pistons only with 3 ring grooves (no dome top pistons allowed)
  8. Stock length I beam rods are allowed
  9. H beams are NOT allowed
  10. Stock cast iron heads, OEM Vortec allowed
  11. Stock type stamped steel rocker arms a. NO roller rockers or roller tips
  12. Screw in studs and guide plates are allowed
  13. Maximum of two (2) valves per cylinder
  14. Max intake 1.94, max exhaust 1.50
  15. Any cast iron or aluminum Dual Plane intake (Can be drilled for Vortec heads)
  16. Compression must not exceed 180lbs
  17. ABSOLUTELY NO porting or polishing!!!
  18. GASOLINE ONLY, 110 MAX
  19. No engine setback allowed

Engine Option #3:

  1. Engine MUST pull 16” of Vacuum @ 1,000 RMPs, NO MORE than 180 lbs compression.
  2. No Vacuum Pumps, must have vacuum port

3.Stock steel small block not to exceed 362 ci. Must be stock bore and stroke (+60 Okay)

  1. NO stroker / hybrids (No 383ci Chevys, No 347 Fords, ect.) All engine casting numbers stamped on the engine must be unaltered.
  2. CAM: Chain driven. 6. LIFTERS: Solid or hydraulic. No rollers or mushrooms. No ceramic.
  3. PISTONS: Dished or Flat. No Domes. RODS: OEM length. Example: SBC must be 5.7” I-Beam Rods No 6” rods. No H-Beam rods.
  4. HEADS: OEM iron heads. Vortec heads okay, Vortec copy okay. Not to exceed 173 intake runner volume. No Porting or Polishing. OEM style stamped steel rockers.
  5. No roller rockers. No roller tipped rockers.
  6. Screw in studs and guide plates OKAY.
  7. No Porting/ Polishing.
  8. VALVES: Maximum of 2 valves per cylinder. Max intake is 2.02. Max exhaust is 1.600. Carburetor: 1. MUST run 500 CFM Holley 2-barrel.
  9. Must remain stock.
  10. No port or polishing.
  11. Throttle arm and butterflies must remain stock d. Choke plate may be removed
  12. Must pass Go/No Go Gauge at anytime
  13. No more than 1 adapter and no more than 1 spacer, with a combined total not to exceed 1” thick
  14. Chassis MUST remain stock for the year and model of car
  15. Stock wheelbase with minimum of 108” ½ inch plus or minus
  16. No rack and pinion steering unless it was manufactured on the car
  17. Aftermarket power steering pumps and steering quickeners are okay but must remain in stock location
  18. Steel driveshafts Only. No carbon fiber
  19. Ford 9” rear end is allowed; all brackets must be in stock location for make and model of vehicle.
  20. No floating brakes
  21. If the battery is in the driver’s compartment, it MUST be in a battery box and securely fastened down. NO Ratchet Straps or Bungee Cords

Shocks/Springs:

  1. Racing shocks are allowed but must remain in stock mounts and stock location for make and model of vehicle.
  2. No Heims or Shock Extensions
  3. Adjustable shocks ARE NOT allowed.
  4. Must be a steel body shock.
  5. No bump stops, bump springs, Packers or any object that stops/slows shock.
  6. Racing springs are allowed (No progressive springs or spring rubbers) and must remain in stock location
  7. Front and rear suspension must remain stock, in stock location, but can be reinforced for strength only.
  8. Ball joints must be stock for the make and model of the car being ran. Plus 1 inch
  9. Tubular upper A arms are allowed. Stock length.
  10. Lower Control Arms MUST BE STOCK
  11. Spindles, Upper control arms, and Lower control arms must be in STOCK LOCATION
  12. No driver adjustable suspension devices
  13. No weight jacks
  14. No Chains, No Cables, and No Tethers allowed anywhere on chassis or suspension
  15. No “Z” links, aftermarket pan hard bars, aftermarket J-bars, torque links, torque arms, damper shocks, fifth coils, ECT.
  16. NO engine setback allowed.

Transmission:

  1. Single disc clutch 10 ½”
  2. No aluminum flywheels
  3. Stock flywheel, must be a minimum of 14 lbs.
  4. Pressure plate Must be a minimum of 13 lbs.
  5. Stock disc type clutch and flywheel required
  6. Stock torque converter, 11” minimum, 38lbs minimum and be functional
  7. Blow proof bellhousing required Exhaust:
  8. Any manifold or header that exits inside frame and under

Bodys:

NO FLAT ROOFS ALLOWED. You can run a stock fiberglassreplacement, example: Speedway.com part number 910-54177

  1. Stock body or sheet metal must look stock appearing.
  2. Hood and deck lid may be hulled
  3. Stock appearing roof and roof must be within 2 ½” from front to back or back to front.
  4. No open holes in firewall or stock floor pan and MUST have firewall between driver and trunk
  5. Enclosed cockpits are allowed but MUST have an inspection hole 6. Rear of car must be closed in 6. Aftermarket nose and tail piece are allowed
  6. Fabricated bumpers are allowed
  7. The rear of the car must have 2 inches of downward slope from the rear glass area to the edge of the trunk lid or tail piece. A minimum of 2 inches.
  8. NO SPOILERS ARE ALLOWED
  9. You can run STOCK floor pan and firewallsin stock location OR
  10. Minimum of three windshield bars in front of driver.
  11. Aluminum high-back seat only, must be bolted in using minimum 0.375 inch bolts. Seat must remain inside all confines of roll cage. Maximum 70 inches from the back of the engine block to the front side of seat, measured at the shoulder harnesses.
  12. Driver must be sealed off from track, driveline, engine and fuel cell.
  13. Kick and rocker panels may be removed.
  14. Front OEM firewall may be replaced using steel fabricated full firewall, 18 gauge or minimum 0.049-inch thickness. Entire firewall can be no further back than 12 inches from the back of engine block, measured horizontally.
  15. Dash must not extend more than 24 inches back from top of firewall. Dash must be flat, extend from door to door, rear can be no higher than front, except for cowl in front of driver.
  16. OEM floor pan may be replaced using steel fabricated floor pan, 18 gauge or minimum 0.049-inch thickness, securely welded to frame. Floor pan may be replaced from front firewall to rear halo supports. Must remain flat/OEM appearing from frame rail to frame rail, can be no higher or lower than frame rail. Exception is maximum eight-inch-tall driveshaft tunnel. Tunnel must remain similar to OEM tunnel in size.
  17. All holes in firewalls must be covered with metal.
  18. No driver adjustable devices allowed while the car is in competition except for the brake adjuster.
  19. No mirrors.

Wheels & Tires:

  1. 15 x 8 steel wheels only
  2. 5 lugs minimum,
  3. No wide 5
  4. Bead locks right side only
  5. Mud Covers are Okay
  6. Any DOT Street tire or Hoosier H500 or American Racer AR500 or ARstocker, G60 Stocker Hard are allowed
  7. Grooving or siping is allowed.
  8. No mud grips

Safety:

  1. MUST have working fire extinguisher mounted within reach of the driver
  2. Full driver’s suit and helmet with shield are MANDATORY
  3. Racing seat and belts will be no older than three (3) years from date of manufacturer ANYTHING THAT IS NOT COVERED IN THE RULES WILL BE DECLARED LEGAL OR ILLEGAL BY THE OFFICIALS