Hilliard Winter Championship
Pro Stock 13 " hitch - 1050#
1. Single cylinder Pro Stock is defined as any tractor having a one cylinder
air cooled four cycled flathead, commercially produced block engine.
Sleeves and welding are permitted. Commercially produced blocks means:
Kohler, Wisconsin, Briggs, Tecumseh. Any other than these, then, the
Hilliard Tractor Club, Inc. must approve. If a copy is being made, engine
must meet manufacturer’s spec’s for engine being copied for: crank and cam
location, deck height, two valves same side, valve angle (max valve single is
6 degrees) and factory Kohler head bolt pattern of other than stock.
2. Original carburetor may be used. Stand off pipe or ram tubes are permitted.
Choke may be removed, single carburetor only. Air restricting venturi must
be in the middle third of carburetor and must be round and not larger
than 1.200 restriction. Must be a Kohler type carburetor if other stock for that
engine model being used. Recast carburetors may be used but must be
patterned after Kohler or Carter Model N Carburetor and meet these spec’s.
Maximum round throttle area outside diameter 1.675. Maximum round choke
plate area outside diameter 1.900. Maximum outside diameter of fuel bowl
8. No pressurized oil systems.
*All Hilliard general and safety rules will be strictly enforced.*