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Section 19 - NATURALLY ASPIRATED 2WD TRUCKS (NA2WD)

Unless specifically outlined below in the class specific rules, the Truck General Rules and the overall General rules outlined above will apply.

19.1 - General Rules

  1. Small tire trucks run at 6500 lbs.

  2. Mandatory 4-point harness and a racing seat

  3. NA2WD vehicles must have 2 working front or rear brakes

  4. NA2WD vehicles will compete at a maximum weight of 6,200 lbs.

19.2 - Chassis

  1. Maximum length to be 15 feet from the center of the rear axle to the furthest, most forward point

  2. Maximum wheelbase for all trucks is 165 inches, regardless of body type

    1. Applies to all NA2WD trucks except for a 10” inch over length allowance for cosmetic fiberglass only.

    2. No steel structure, reinforcement, or steel bumpers allowed past 15 feet.

  3. All vehicles must have vertical bumpers to prevent vehicles from passing over the buckboard of the sled while backing up to hook or unhook.

    1. Bottom to be maximum of 24 inches from the ground.

    2. Bumpers must extend a minimum of 8” vertically.

  4. Maximum width of vehicle is eight (8) feet

  5. All vehicles must have an approved fire wall with no openings larger than ½”

  6. Only ¼” Lexan, .060 steel, or 3/16 aluminum are the only materials allowed for firewalls. No plexiglass firewalls permitted.

  7. Air or hydraulic devices to raise or lower the front of the chassis is prohibited

19.3 - Engine

  1. Maximum of 540 cubic inch limit +1%

  2. Only one automotive type of mass-produced engine, with only two valves per cylinder.

  3. Engine block must have standard OEM bore spacing and accept a stock OEM automotive crankshaft.

  4. Aftermarket cast iron blocks are allowed but aluminum blocks will NOT be allowed.

  5. No Hemi engines. Only two (2) valves per cylinder.

  6. Billet engine blocks are not allowed.

  8. Aluminum heads allowed.

  9. Hand/CNC porting, straight planning, larger valves and raised port heads are allowed.

  10. No electronic fuel injectors or metering devices will be allowed.

  11. No electronic traction control allowed.

  12. No electronics to engage clutch will be allowed.

  13. Electronic control devices or programmable boxes for ignition timing are prohibited.

  14. No blowers or turbos

  15. All harmonic balancers must be SFI 18.1 spec. A bolt to hold the balancer to the crankshaft is required.

19.4 - Tires

  1. Tractor or aftermarket pulling tires. 44.8” height x 19.40” width or 16-1-18.4

  2. No dual rear wheels allowed.

  3. Nichols Tires are not allowed.

  4. Wide Mayhill tires are not allowed.

19.5 - Weights

  1. Weights cannot extend more than 12 inches past the drawbar.

19.6 - Fuel

  1. VP Racing Fuel is the only fuel that is allowed for use in all pulling vehicles.

  2. Absolutely no additives – (except VP top lube)

  3. All fuel lines must be steel braided or high pressure reinforced rubber. No plastic tubing is allowed unless OEM installed and approved.