ACL Race Series main bearing set for BMW S65B40 4.0L V8 engines in .025mm undersize. This main bearing set is specified for crankshafts machined to that undersize and supplies the complete main shells needed for bottom‑end reassembly. Select this .025mm option when your engine build or machining spec requires the slightly smaller journal sizing.

ACL BMW S65B40 4.0L V8 .025mm Oversized Main Bearings