ACL Race Series main bearing set for BMW S65B40 4.0L V8 engines in .25mm (0.010") sizing. This set matches crankshafts machined to that undersize and supplies the main shells necessary for proper journal clearance during reassembly. Choose the .25mm option when machining or rebuild specifications call for that dimension on the main journals.

ACL BMW S65B40 4.0L V8 .25mm Oversized Main Bearings