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Originally Posted by Colossus
Get someone to machine your crank a tenth over, then get tenth over bearings. You can go further, and get even bigger over bearings. But, go with a tenth and see if it removes the scratch. It should. They dont make a thousandth over, so the next step is a tenth.
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Don't do this, your oil clearances will be screwed and you'll crap out another motor, if your crank is out of spec after a slight polishing, scrap it and find another. The other reason you don't want to do this is the crank will be weakened due to the fact that the nitrate coating will be eliminated, and if you wasted any bearings bad on the crank get the block line honed.
P.S. you can never take too many measurements while building a motor, double and triple check you oil clearances and make sure everything is within spec. I take 80-100 measurements when doing a build, this ensures maximum efficientcy and longevity.