Two Wheel Drive Trucks
• Single automotive type V-8 engine
• Maximum 575 cubic inches, turbos or superchargers allowed
• 15′ maximum length from front of truck to center of rear wheels
• Maximum width: 8 ft.
• H.P. ranging between 1,200 to over 2,000
• Rear tires 18.4 x 16.1 inches, maximum circumference 143 inches on 18″ rim at 28 psi.
• Maximum total vehicle weight: 6,200 lbs.
• Planetary rear end allowed

Four Wheel Drive Trucks
• Single naturally aspirated automotive type engine
• Maximum 650 cubic inches
• Maximum 133″ wheel base
• H.P. ranging between 1,000 to 1,300
• Tires may not exceed 18″ tread width by 38″ high
• Maximum total vehicle weight: 6,200 lbs.
• Must maintain original appearance, w/hood, grill & fenders in place as intended by manufacturer
• Tires: maximum 112 inch circumference on 20 inch rim, at 30 psi.

Mini Rods
• Single automotive type V-8 engine
• Maximum 575 cubic inches blown, 650 cid naturally aspirated
• H.P. from 1,800 to 2,000
• 8′ Maximum length from center of rear wheels
• Maximum width of 6′
• Rear tires maximum 18.4 x 16.1 inches, maximum circumference 143 inches at 28 psi,
• Maximum total vehicle weight: 2000 lbs. (increased in 2000)

Super Farm
• Engine: Size limited to 640 cubic inches
• Stock agricultural head on engine
• Stock intake an d exhaust manifolds
• Compete at 9,300 lbs.
• Tires a maximum of 48 lugs on a 24.5 by 32 tire
• Retain stock appearance

Open Super Stock
• Stock or OEM block
• H.P. up to 2000
• Diesel or Alcohol powered
• Stock crankshaft, transmission housing and final drive
• Stock frame, hood and grill
• Maximum 114″ wheelbase
• Maximum length of 13′ from center of rear wheels
• Rear tires 30.5″ maximum width
• Up to 4 turbos at 250 psi boos
• SFI 4.2 bellhousing blanket required

Diesel Super Stock
• Same as above, but only diesel powered vehicles

Pro Stock
• Engine: Must be mounted in original position
• Hood & grillwork mounted in original location as intended by manufacturer
• Maximum weight: 10,000 lbs.
• Limited to 1 turbocharger
• Tires: Maximum width, 24.5″
• No engine larger than 680 cid (+ or – 1%)

Modified
• Fuel: Gas or Alcohol
• Engines: Limited number depending on engine type, any combination
• Maximum length 14′ forward of the center of rear wheels
• No motor or cubic inch limit
• H.P. ranging from 6,000 to 11,000
• Rear tires 30.5″ maximum width
• Maximum total vehicle weight: 7500 lbs

Unlimited Modified
• Maximum weight 8000 lbs.
• Fuel: Gas or Alcohol
• Engines: Unlimited – any number or combinations of engines or type
• Maximum length 14′ forward of the center of rear wheels
• No motor or cubic inch limit
• Rear tires 30.5″ maximum width

Super Semis
• Maximum weight 20,000 lbs. with 250 inch maximum wheelbase
• One production available commercial truck engine allowed
• Stock appearance truck of that year
• Road use approved tires that are available to the public
• Only tandem axle semi-trucks
• Only two stages of air pressure allowed with combination of turbo and/or supercharges