With thinwall sleeves 3-7/16 bore is the most you can go on a regular H block without machine work. If you want to run sleeves the next step with machine work is 3-9/16 bore thinwall SH sleeve and piston set. The block doesn't have to be bored as much with that set compared to the 300, 350 thinwall 3-5/8 ID sleeves. If you run the pistons on the block without sleeves, sometimes some 3-9/16 pistons can be fitted, or the block can be sized for 3-5/8 pistons. If you have a good block casting most all the above will work. If not get ready for more machine work or finding another block. If your tractor is a early one I would pass on boreing it. If you get 3-5/8 pistons, most if not all now have the small piston pin. You would need adapter bushings in your connecting rods to use. some 3-9/16 have the small pin also. Just my opinion when using 3-5/8 pistons and the block bore castings look good. I go for opening the bore roughly 1/16 and running on yhe block. If you wear that out it can be bored for the sleeve then. Know a few that farmed running pistons in block and they lasted good.
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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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