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You also need to set the thrust bearing shells. Do this with the first four main caps installed and torqued down. With the cap containing the thrust bearing (the rearmost on Chevys) in place but the bolts not tightened, use your rubber mallet to smack the nose of the crank to push it backwards in the block. Then hit the rear of the crank to push it back forward. This aligns the two thrust bearing shells. Always align the thrust bearing with as much forward clearance as possible (by hitting the crank toward the front of the block last) because the clutch is always trying to push the crank out the front of the block. Now you’re ready to tighten your final main cap.