4. Weights: Weights must not extend rearward beyond rear tires and cannot be more than 11 feet from the center of the rear axle to the furthest point forward.

5. Tires and Rims: Maximum tire size – 18.4 X 38; any rim width. No radial tires. No steel wheels. Two wheel drive only. No duals. Any cut allowed on tires.

6. RPM’s: RPM’s allowed will be determined by the NATPA RPM chart. Any tractor not listed will use manufacturer’s data. A 10% margin of error will be permitted. All tractors to have positive throttle stops with a working governor in the stock location.

7. Speed: any gear, speed limit is 4 MPH, to be checked by radar. No shifting of TA’s. One beep after flag/cone will result in disqualification. The marker for speed will also be used as the mark to stop the tractor if driver wishes to restart pull.

8. Tractors manufactured to use diesel fuel only cannot be converted to gas or LP. Tractors must be naturally aspirated. No turbos or blowers – except Oliver 99GM, etc.

9. Tractors must have the stock engine, frames, transmission, rear end and axle housing or manufacturer’s replacement. Stock heads and their replacements are to remain unchanged in outside appearance. No 7 bolt main blocks in Olivers; no (12) port heads; no 99 heads; no 1600 series heads. AC–WC/WD/WD45 can use D-17 engine; IH – H, 350; M, 450, JD – A/B/G can use power blocks. No M-M 800 heads or blocks. Dual exhaust not allowed except after stock manifolds.

10. Enhanced electrical systems permitted in all classes. No rev limiters allowed.

11. Replacement carburetors with no modification of carburetor or manifold. Overhang of carburetor to manifold is not allowed. Only stock appearing manifolds are allowed.

12. No increased height in any tractors (i.e.: deck plates, shims, girdles) except for stock gasket.13.$10 Hook fee. 1st through 3rd = trophies, 4th through 6th = belt buckles.