find the spec in the book. open up a micrometer to that spec, set up a dial bore gauge from the micrometer, set it to zero, and walk it down the bore observing how far off of zero it reads, then again at 90 degrees from where you first measured. this will tell you if it's out of round, or tapered. we like them really round, and tapered no more than .002 ( thou.). more than that and the rings may not seal, and there could be piston slap. even .002 is not really too good.
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