It has something to do with the cooling process. You can scratch the outside of a new engine pretty easy with a screw driver, but it takes a bit more pressure on the cylinder wall. Similar to tempering steel. It seems to me that oversize rings are made of a softer material than standard when it comes to aluminum block engines. I know what you mean about the nikasil. My sled has it. My Briggs is a 74, so nothing so fancy. Perhaps I will take her to the engine machine shop. It's not a restoration thing like my Ferguson, it's just me being cheap. But the less money I spent on the blower, the more I have for my TEA20.
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