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Message: [QUOTE="Bunya, post: 1198195, member: 77196"] No, you can't! Sorry Dirt but there's no way a caliper is accurate enough for these measurements. In the hands of a skilled machinist, they're good for maybe .001". In the hands of a novice, you can't expect any better than .005". A machinst NEVER uses calipers for measurements that are more critical than several thousanths. According to Matego, the mean difference between the A & B is .0003", more than 10x smaller than what can be measured by the average guy with a caliper. These measurements have to be taken with a micrometer. Again, attempting to take [i]accurate[/i] measurements down to tenths is not a trivial task and beyond the capabilities of most folks. No way! Assuming equivalent quality, a vernier or dial would be a better choice. Digital calipers only read to the nearest .0005 and due to display errors that's +/-.0005 on top of the basic accuracy. The average differance between the A & B is .0003 so a digital can't resolve the difference. With a vernier or dial, you can interpolate the reading down to a few tenths. But again, this is beyond reasonable accuracy for a caliper! I tend to agree with Ol'89r, that if the difference between A & B is a few tenths, I wouldn't be too concerned about it unless you really push the engine hard all the time. [/QUOTE]