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Message: <blockquote data-quote="flyerdan" data-source="post: 108177" data-attributes="member: 2510">A lip on the cylinder wall at the top is a ridge, and it's common. There is a tool called a ridge reamer that cuts it down to the same size as the bore so the pistons will come out. A few thousandths will feel like a lot to the fingernail but still be within spec.If the rest of the engine is in good shape it will probably be a lot cheaper (not to mention loads easier) to do an overhaul. You can rent a reamer from lots of parts stores for little, often just a refundable deposit if you buy parts there. Rock auto will have discount parts for the engine. Staying OEM also eliminates all the headaches associated with a repower; unless you already have a donor engine, a complete metal fab shop and a penchant for bodging, most attempts never get completed.</blockquote>