ACL 5M1038H Small Block Chevy, Main Bearings, Fits 400 Main Size, H Series For Forged Crankshaft

ACL Race Series performance engine bearings are manufactured to exacting tolerances. Micron tolerance machining supported by precision measurement systems delivers consistent accuracy to key characteristics like wall thickness and crush. This ensures reliable fit and helps maintain consistent clearances. BEARING MATERIAL ENHANCEMENTS A blend of characteristics to provide high strength and excellent seizure resistance. No flash plating is applied to further improve bearing retention and maximise heat transfer.