ACL

5M667P-30

ACL 5M667P-30 Main Bearing Set

Rod & Main Bearings

1963-1976 > Pontiac > All Models > Pontiac V8 421-428-455ci
** NOTE : PRODUCT IMAGE MAY NOT BE VEHICLE SPECIFIC

ACL's main bearings are made of a softer metal so that you don't wear out your crank or engine block. Additionally a thin layer of oil lubricates the connection between the bearings and the crank allowing the crank to "float" and reduce wear. Proper support via main bearings is crucial to prevent oscillations and wear that can damage the crankshaft and other components as the motor moves further out of balance.

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