| PGTPA |
| Piedmont Lawn & Garden Tractor Pullers Association |
| Stock Altered - NQS Rules |
| 1. Single cylinder four cycle flafhead engines only. 2. Engines must be Kohler, Wisconsin, Tecumseh, or Briggs. 3. Engine blocks must have an OEM stock appearance. 4. Engines must be factory productions with factory deck height 5. Stock head bolt pattern =>stockhead gasket must fit over studs or bolts. 6. Stock head bolt location and head bolt size. 7. Maximum crankshaft stroke 3.25". 8. Maximum engine bore 3.780" 9. 36.5000 cubic inch limit 10. Maximum engine valve size 1.380" 11. Maximum engine valve lift .330" 12. Maximum carb venuri size 1.00", no air entering after 1.00" restriction, venturi must be round in shape. 13. Carburetor must be mounted to the engine with no more than 1" spacer. 14. No reverse port engines allowed, carburetor must go to the original intake port. 15. Carburetor must be a stock appearing Kohler-type. 16. Billet heads permitted. 17. Porting and polishing allowed. 18. No external welding or external modification allowed. 19. All thread through finned area is acceptable. 20. Welding permitted in crankcase area of the block for repair. 21. Methanol only. (NO NITRO OR ANY OTHER FUEL ADDITIVE) 22. Must run a factory appearing hood and grill. 23. Tractors must have garden tractor rear-ends. 24. Tractors must use stock garden tractor frames. 25. Frames must maintain factory length. 26. Weight class 1050 lbs. 27. Wheelbase: 52 inches maximum 28. Top placing tractors will checked for, but not limited to: Fuel, Bore, Stroke, Carb Size, Valve Lift, Valve Size and Deck Height. Cubic Inch: 36.500 Cu. In. No Tolerance. Formula for CU, IN. is Measured Bore X Measured Bore X Measured Stroke X .785 Cu. In. All bores measured 90 degrees from thrust side. Stoke: 3.250" maximum 0.010" measuring tolerance, must not exceed Cu. In. Limit Bore: 3.780" maximum 0.010" measuring tolerance, must not exceed Cu. In. Limit. Carb: 1.000" venturi size maximum 0.001" measuring tolerance. Valve Lift: .330" maximum 0.003" measuring tolerance. Valve Size: 1.380" maximum 0.001" measuring tolerance Head Bolt Pattern: Stock Gasket must fit over head studs or bolts. RULE CLARIFICATION: what can and cannot be done to the outside of the engine in the port area. Any intake port will be checked including one's that have been braced or repaired. They will be checked for stock carb mounting stud locations, center to center distance, height and port location. Excessive and unnecessary build-up on the outside of the intake port will result in disqualification. Build up is port epoxy. Weld or bracing or any other means of distorting the port's facoty dimensions. NOTE: Pullers, if you have the factory fan shrouding in place and during tear down thet tech person needs to inspect your engine's intake port, you will be required to remove the shrouding, even if it requires removing the engine from the chassis. So please have your intake port fully visible for the tear down procedure. |