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Guys building 10,000 HP drag race engines still double check bearing clearances with PlastiGauge. It's the only way to be 100% sure that the clearance is right. Unless, of course, you know of someone real tiny who can fit in there and measure that gap.
Inside and outside micrometers will do the job a lot more accurately than plastigauge. Those 10000 hp dragsters if there is such a beast are built to run maybe twice before they tear them down and rebuild. Most rebuild after 1 run and speed is essential.
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