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 - Fabrication (Who Me? Make it myself?) - by Chris Pratt. First of all, what are the reasons for not fabricatin your own parts? Most judgements on what should be purchased rather than fabricated stem from: Originality - If the tractor restoration is to be 100% original, it is likely that you should spend the time and money to locate the component in the used or New-old-stock market. Since this can be extremely difficult, you may want to fabricate the item or purchase a modern replacement temporarily, but eventually, you s
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