ACL Race Series big end bearings for the M20, M50, M52 and M54 engines, as found in many 3 Series, 5 Series, Z3/Z4 etc. ACL bearings are a vital upgrade that increase the life and strength of your engine.

Choose from OE size, +.025, or HX series for an extra .001″ oil clearance. Oversizes available by request. Combine with ARP connecting rod bolts for the perfect upgrade.

Why not add a bottle of Hack Engineering Engine Assembly Lubricant to protect your new bearings on first start up?

Please note that we cannot take opened packets of bearings or bolts as a return – please double check that you have the right components before opening packages.

*Oversized options are for crankshafts that have been machined. Standard sized bearings are for non-machined crankshafts.