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One often overlooked clearance when building even a mild street engine is crankshaft thrust. With our old crank, the new bearings measured less than 0.001 inch of thrust clearance, which is far short of the 0.003- to 0.010-inch spec. We placed 180-grit wet/dry emery paper wetted with solvent on a flat surface and carefully sanded only the forward thrust bearing surface until we had 0.005-inch thrust clearance. Be sure to surgically clean the bearing with alcohol and paper towels before final installation.