M and SM gasoline heads use the same valve numbers. Maybe a small power loss with some M gasoline heads compared to a super. Probably couldn't feel it on most tractors. Really need to know the head number removed and the one being installed. Late M and SM tractors used gasoline heads 8060 DC or 8574 DB. Lower suffix letters came on most M tractors. But lots of heads were replaced over the years. So you can find 8060 DC and 8574 DB on some M tractors now. Can also find 8060 DD and 8574 DC the replacement for previous heads on M and SM tractors. My be just my luck that I seem to find less 8574 DC heads cracked than the others. There was also a newer replacement head number that shows up rarely. You could also use 400 and 450 heads if wanted or found.
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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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