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The connecting rods’ ARP bolts were hitting the block because of the longer stroke on the 383 crank, so some slight clearance was needed (0.060 inch). Hernandez used a carbide bit and a die grinder to remove the metal from the block that caused interference. This step could be done at home, but make sure to only take off the minimal amount of material needed to provide .060 of clearance. You should also check the connecting rods-to-cam clearance as there may or may not be interference depending on your setup. If you have interference then .060 of material removal should be enough for the cam to connecting rod.