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ACL Race Series main bearing set for BMW N63B44 and S63B44 4.4L V8 engines in .025mm (0.001") undersize. This Race Series main bearing set matches crankshafts machined to that specific undersize and supplies the complete main shells for engine reassembly. Choose this undersize set when your machining spec calls for a 0.001" reduction to restore proper journal clearance.
ACL BMW N63B44/S63B44 4.4L V8 .025mm Oversized Main Bearings
