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At home, we ground the casting flash and rough edges off the block, crank, and rods with a combination of carbide bits and sand rolls on a rotary grinding tool we bought at Harbor Freight. Be sure to cover all critical mating surfaces with a couple of layers of masking tape to avoid damage. Back at JMS, Mike showed us a quicker way to polish the connecting rod beams on a belt sander. Not only does this smooth the surface of the rods, but it also helps remove areas where cracks can form.