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ACL Race Series main bearing set for BMW N63B44 and S63B44 4.4L V8 engines in .50mm (0.020") sizing. This set matches crankshafts machined to the .50mm undersize and includes the main shells required to restore proper journal clearances during an engine rebuild. Choose the .50mm option when your machining spec indicates that dimension for the main journals.
ACL BMW N63B44/S63B44 4.4L V8 .50mm Oversized Main Bearings
