Pro Stock Class Rules

Pro Stock Rules

This class is open to youngsters age 12 - 19. Pro Stock will be open for drivers up to age 21 that have had 3 years prior pulling experience in our club and pass safety checks with Event Offical's.This class is a high budget class for experienced pullers. With open RPM tractors on the loose there is never a dull moment! Tractors range from 65 to 90 horsepower.
1. All tractors must use lawnmower type motor. 45.6 cubic inch V-Twin maximum.  50.5 cubic inch Single cylinder maximum.

2. Maximum carburetor venture size 1.2 inch for single barrel carburetor, 22mm venture size for two-barrel carburetor. Venturi must be round in shape. Choke plates may be 
removed. Single cylinder motors can use up to 53mm carburetor. V-Twin motors must use stock heads. 

3. Pro Stock shielding rule: Single cylinder: ALL engines must have a scatter shield opposite the cam side of the motor. It must be made of 1/8 inch steel or 3/16 inch aluminum. It must cover full height and width of block and be attached in a secure manner to frame and head or head plate. Shield must be attached to frame at the bottom and to the flywheel shield at the top to make rigid. V-Twin 1/8 inch steel or 3/16 inch aluminum on external side of cylinder extending from head gasket to frame.

4. Flywheel must be covered 360 degrees. 
Flywheel shielding: 360 degrees around the flywheel with 1/8 inch steel or 3/16 aluminum if you are running over 4000 RPM’s.

5. If you are running more than 4000 RPM’s you must use a Billet flywheel and shielding. Refer to rule #4

6. If you are running a stock flywheel for the make and model of the tractor, you CANNOT run over 4000 RPM’s.

7. Unlimited RPM limit.

8. Relocation of components allowed.

9. Modifying of body panels allowed.

10. All belts and clutches must be covered a minimum of 180 degrees.

11. NO turbos

12. 8 foot length limit from center of rear axle to furthest point front including weights.

13. No portion of any tractor may exceed 6 feet in width. No more than 2 inches wider than tire at any time, including weights.

14. All tractors must have rear mounted tether switch that kills the fuel pump and ignition. The switch will be located within 6 inches of either side of center back of tractor with a minimum of a 1 ½ inch loop for hooking.

15. Bar lug and V-tread Pro pulling tires allowed. Bar lug tires may be cut.

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