The standard bore would measure 3.375. I don't know for sure how much clearance they gave the cast iron pistons. I guess I installed one set back in 1958, rest were always aluminum. Don't have specs right handy. I like to fit the aluminum with right at .0035 clearance if possible. Had scoring when less than that on an H. I never heard of someone boring a cyl and using same pistons but you never know. I would measure below that bottom most ridge in cyl to get the original bore size. Normally any ridge in bottom indicates ring wear caused from lower end poor oiling or just plain wore out from long hours. As far as knurling cast iron, I don't think anyone will do it due to cracking the pistons during process. At .010 clearance all up and down the cyl you can not expect real good results. If it was just the top inch or two you would get by fairly well.
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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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