The difference in size is below the margin of error of most basic measurement devices. I have a very expensive, calibrated three point bore mic set in work. I'm sure most reputable shops have similar. Anything less and don't even bother. After measuring a few cylinders in many dimmensions, and noting the appearance along with that of the pistons, I now just do a visual, clean up, and replace the piston with a micro size up. Never a problem. I can tell you that the bores are not round or straight, as one would expect, but does it matter? No, not at the numbers we are talking about. Once I was in a jam and had to put a "D" piston in a used "A" bore, again no problem.
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