Don't know if all tractors do, but some 300 with fire craters will hit the H head. If you look at your 300 head you will see the edge on the other side from spark plug is sloped off and the H is not. You can grind that sharp edge on the H head to work if the piston hits. Make all 4 the same and don't go to deep. IH sloped the edge in combustion chamber on the 8043 head when they put it on a SH and advanced the suffix to DD. May not notice any power change.
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Today's Featured Article - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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