Mix Class (Naturally Aspirated SS, Hot Rod, & Light Hot Farm) Rules

Naturally Aspirated Super Stock, Hot Rod, & Light Hot Farm Rules

(Revised – Dec. 2017)

Weights: 6500# Light Hot Farm, 6000# V8, and
              6200# Naturally Aspirated Super Stock

Hitch Height: 20 inches
– COPTA Hot Rod small block. Full-Pull Productions V-8 big block.
– COPTA Naturally Aspirated Super Stock
– AFPA 6500# Light Hot Farm

AFPA 6500# Light Hot Farm Rules:

  1. Limited to box stock Borg s300sxe 2.42 turbo charger. Must be bought thru AFPA and sealed at start of season. Revised – Dec. 2017
  2. lnjection pump- up to and including Bosch P Pump
  3. Diesel RPM 480 Cubic inch and down to 400: 3000RPM. 399 Cubic inch and down: 3800 RPM. Must have ISSPRO R8906 same as pro farm class. Revised – Dec. 2017
  4. Gas tractors, Naturally Aspirated no cubic inch limit and no RPM limit.
  5. No water injection, no inner or after coolers.
  6. OEM exhaust and intake manifolds for engines being used. No re casted heads for turbo charged engines.
  7. Front weights no more than 13 feet from center of axle. All tractors must have front lifting device for towing.
  8. 18.4 x 38 tires maximum, any cut, radials allowed.
  9. Hitch height 20 inches–18 inches from center of axle minimum.
  10. No shifting up or down while in competition.
  11. Any sheet metal, engine, rear end combination. Must have stock transmissions, and axle housing. No profab- style transmissions. No Component Tractors.
  12. No Data Loggers or Computers


  1. SFI clutches, steel flywheels and scatter blankets required.
  2. Tie bars required.
  3. Helmet and fire suit and fire extinguisher required.
  4. Roll cages, minimum 2-bar assemblies, high back seat and 5 point harness.
  5. Guillotine Air Shut Off required. On board fuel shut off accessible from strapped-in position.
  6. Deadman throttle and wide front end required.
  7. Wheelie bars per club safety rules.
  8. No hanging weights can extend past rear tire. Must have 200 lb. of movable weight.
  9. Side Shields required. Fenders must extend above top of tire.
  10. 2 3/8 inch bolts in cross pattern in exhaust.