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I never use clay or solder either.
Physically measure stuff with dial calipers, micrometers, and/or depth gauges instead, then verify odd shaped stuff with the burette and colored alcohol.
Of course, there's a difference between a street engine where the only thing that will happen is you'll need to run a different grade of fuel or give up a few hp. In racing, the sanctioning body could throw you out if the compression ratio is off, potentially costing you $$ or points.
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