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351 Cleveland Performance Engine Build Main Bearings

Main bearings in the 351C are smaller than the 351W. The logic is less friction. Oil comes from a common galley that feeds the cam and lifters. We improve oil flow to the mains by controlling flow to the cam and lifters.
351C Performance With Common Parts - A Cleveland Course of Action

Main bearings in the 351C are smaller than the 351W. The logic is less friction. Oil comes from a common galley that feeds the cam and lifters. We improve oil flow to the mains by controlling flow to the cam and lifters.  View Related Article