1. Maximum engine size will be 485 cubic inches. Aluminum cylinder heads allowed. Must have O.E.M. intake bolt pattern. No sheet metal intakes. Single naturally aspirated carburetor, no splits. No tunnel rams allowed. Roller cams allowed. Aluminum intake allowed. (Single plane & Dominator style.) Any cast iron head allowed.

2. Exhaust systems must run down and back or up through the hood. Adequate clearance around headers will be allowed to permit opening of hood. If you burn alcohol, you must run with headers up. You can also run exhaust spacers.

3. High stall torque converters and safety-approved clutch will be allowed.

4. Maximum wheelbase will be 134 inches. Body sheet metal must conform to wheelbase. Fiberglass bodies allowed. Any make engine allowed with any make body.

5. Hitch height is 26 inches and length no less than 36% of wheelbase before, during, and after pull.

6. Tires maximum 31.5 x 15.5 x 15 Terra tires or Bar tires. No duals, chains, or studs. Dick Cepeks are allowed. Street legal tires may run in this class. Maximum for these is 16.5 x 12.5 x 33. Outside corner to outside corner tread is measurement.

7. Rear of block can be no more forward than 12 inches from center of front axle tube.

8. Engine must be shielded at least .060 inch thickness. Height to extend to bottom of cylinder head and must cover entire length of engine. No unnecessary holes in firewall. Any engine driven fan must be shrouded 360 degrees.

9. Drive train will consist of the following: any front axle, any transfer case, any rear axle; no planetary axle allowed. Must have OEM frame rails.

10. Weight box maximum width is 84 inches, not to exceed 60 inches forward from top center position of front axle tube.

11. Tilt bodies allowed,both doors working. Must go .060 inch or thicker on floor board.

12. No dirt deflectors.

13. No rule changes until Fall 2007.