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When installing the main caps in the block—no matter if you are fitting bearings or final assembly—don’t use the bolts to pull the caps down into the register. This is supposed to be a tight fit and doing it that way can damage both the cap and the register in the block which will lead to cap movement. Instead, slide one side into the register, thread the bolts in a bit to make sure the cap is properly aligned, and use a rubber mallet to tap the other side of the cap into position. Now you’re ready to torque the caps.