ACL Bearings 5M1039P .004 O/W FLANGE - FORD 370/429/460 V8

The ACL 5M5217P-20 is a set of main bearings designed for Chevrolet V8 engines. These bearings are crafted with a unique blend of design, metallurgy, and engineering to meet the demands of high RPM conditions. They aim to deliver a dependable solution for performance applications, whether for casual driving or racing.

The ACL main bearings feature a high-strength overlay plate with reduced thickness for enhanced fatigue properties and longevity. They have hardened steel backs for improved support and retention within the housing. Increased crush ensures better bearing retention, and the elimination of flash plating on the backs enhances heat transfer and grip. Increased eccentricity helps counteract bore distortion at high RPM, and 3/4 grooved main bearings optimize load-carrying surface area and oil flow. Tight and consistent wall tolerances maintain precise clearances, and enlarged ID chamfers accommodate large fillet radii on performance crankshafts.