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Return to Parts List Category : N- Tools & Books ARE AR303 CRANKSHAFT HOLDING TOOL FITS 6-BOLT & 8-BOLT CRANKS, BIG BLOCK & SMALL BLOCK $19.00 AR303 – Crankshaft Holding Tool. This tool bolts onto the crankshaft flange to hold the crank while installing the crankshaft bolt. Fits either 6 bolt or 8 bolt crankshafts. Made from high strength steel, use with a ¾ inch drive.