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First of all, do you mean imperial or metric? Measuring to "ten-thou" is not as precise as measuring to 0.001mm like the factory.
Cheapest method: Bore gage with high precision dial indicator. Set this with an outside micrometer- calibrate the mic with a standard, then set the mic to the diameter, then set the bore gage up inside the mic jaws. You will probably need to mount the mic on a clamp stand to do this.
Better method: get a ring gage in the exact size and use that to set the bore gage.
Even better method: pistol-grip type bore gage, there are Chinese ones available that are a LOT cheaper than the Japanese ones.
Better: Mitutoyo Holtest
Ultimate: Brown & Sharpe Intrimik
Super-Ultimate-- Digital CMM with ruby tip-- get a three dimensional map while your'e at it.
I love dimensional metrology!
But seriously, try the bore gage and mic method first, it's what most of us use. It's an aircooled engine for heavens sake, once it gets up to temp the cylinders go all banana-shaped anyway.
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