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Jim & John are exactly right. Since the Continental engines are wet sleeves, it would be really tough to overbore a damaged block to accept oversized OD sleeves, maybe impossible. They are not like Ford N blocks. Sleeve sets you see on this site, and most other web sites are Tisco "super power" overbore sets. Most places don't even stock standard bore sleeves. The only reason I could see to stick with standard bore sleeves is if you are only replacing one damaged sleeve/piston, and not all four. But even then, I have heard of guys that replaced one or two sleeves with overbore sleeves and the rest were stock, with no apparent running problems. I installed the Tisco overbore sleeve/pistons in my TO-20. I was quite happy with the quality and fit. The sleeve/piston sets come with new Orings, piston rings, and pins if memory serves me right. The install is quite easy, don't need to modify anything, just install normally. George
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