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Replacing the cam bearings is standard procedure in any engine build. The process involves tapping the bearings into the cam tunnel with a special installation tool and a hammer. Care must be taken to ensure that the oiling holes in the cam tunnel align perfectly with the holes in the bearings. This is particularly important on production blocks that lubricate the cam bearings before the crank and rods. Most machine shops will charge about $30 to install new bearings.