May not matter if its not used for heavy work. But as Pete said IH recommended a 17 degree impulse coupling rotating unit complete be installed in the magneto for FC pistons in a M. On a 400 and 450 IH recomended only using fire crater with a distributor. Also not to have total timing over 25 degrees at the crankshaft. They had a template in some sets to mark the crankshaft pulley if it didn't have the mark. Not sure if IH recommendations can be compared with now. But in the sixties when a lot of fire crater kits were being put in I think the gas octane was as good as todays. At least what Dad used on the farm, we used it in 10.5 to 1 compression engines with no problem.
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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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