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I am rebuilding the 351m that was in my 79 ford f100. I decided to turn it into a 400. I ordered a crankshaft from northern auto parts that is thirty under with bearings to match. When I plastigauged the mains I found that my clearances were between .002 and .003. Everywhere I look it says my clearances should be between .0008 and .0015. As far as I know the only problem would be they messed up on turning the crank. Could there be another issue?