How much bigger depends on what kind of chance you want to take on the cylinder wall getting to thin. Without going to special made pistons you have a few choices.
Use 3.5625 pistons and sleeves for a SH and bore the H block about .125. That gives you 169 CI. Use 3.625 pistons and bore to use the pistons without sleeves. 175 CI. If the sleeveless bore in the H block is good and you can get the correct cylinder wall to piston clearance the 3.5625 pistons can be put in a H without useing sleeves. To use 3.625 pistons with sleeves the H needs bored to around 3.750. Some won't do it without problems.
If the tractor is going to be used other than pulling and you decide to bore. Think about the 3.625 on the block. Then if another rebuild is ever wanted bore just a little and install 3-9/16 pistons and sleeves for a SH. Or if they work for your block use 3.562 pistons without sleeves, then the sleeves for 3.562 pistons in a SH if the bore wears out. Or bore again to use the 3.625 pistons.
Don't know what cylinder head you have but some pistons for the bigger bore will contact a H head unless the head chamber edge is rounded a little. Filler rings or special head gasket maybe needed for some combinations.
Also if any machine work is done the parts that are to be used size is needed, or better the parts on hand and measured.
Block bores without sleeves will measure around these numbers or a little larger. H block 3.5625, C-164-3.6875, C-169 and C175- 3.749.
This post was edited by D Slater at 04:58:04 01/13/13.
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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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