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Section 28 - 540 LIGHT PRO STOCK TRACTORS (540)

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

28.1 - General Rules

  1. Component chassis is allowed in the 540 Light Pro Stock Tractor class.

  2. 540 Light Pro Stock Tractors will compete at the following weights:

    1. Component chassis tractors will compete at a maximum of 8500 lbs.

    2. OEM Cast chassis tractors will compete at a maximum of 8700 lbs.

    3. Weight must include all safety equipment.

28.2 - Tires

  1. Tire size allowed is 24.5 x 32 maximum. See General Tractor Rules for dimensions.

28.3 - Engine

  1. 540 max cubic inches

  2. Any 7100 series p pump

  3. Aftermarket heads allowed must be OEM size length, ports in OEM location, and accept manifolds in stock location, no more than 1” taller than stock.

  4. Recast blocks are allowed, must be OEM size and spec.

  5. 1” deck plate allowed

  6. No cooling devices besides water injection.

28.4 - Turbocharger

  1. Any turbo allowed, with 4.5” max exhaust wheel

  2. Exhaust Wheel must protrude 1/8” into housing

  3. All exhaust to exit through max 4.5” bore in housing.

  4. Maximum 5-inch intake housing.

  5. Refer to rule 20.6.3 “Tractor General: Turbochargers” for inspection process

  6. A turbocharger pressure pipe blanket is required

    1. Turbo outlet pressure pipe between the turbocharger and the intake manifold must be wrapped 360 degrees with an OTTPA accepted blanket.

    2. Blanket must be placed as close to compressor housing outlet neck as possible and extend at least 6 (six) inches beyond the first bend in pipe or a minimum blanket length of 18 inches, whichever is longest.

    3. Any pressure pipe shorter than 18-inches must have blanket covering the entire length of pipe.

    4. Blanket must be purchased from an OTTPA approved manufacturer containing a minimum of 5 (five) layers of Kevlar. A blanket displaying a SFI 4.1 certification is accepted but not required.

28.5 - Fuel & Water

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

  2. VGM water is the only water injected water that is allowed.

  3. A \$50 fine will be assessed for lack of fuel and water test ports for all classes.

  4. A \$50 fine will be assessed for any minor infractions of fuel or water quality.