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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