ACL Main Bearings for GM LS Gen III-IV 270° Oil Groove .025mm Undersize Coated

ACL Main Bearings for GM LS Gen III-IV — 270° Oil Groove, .025mm Undersize, Coated Brand: ACL Engineered for performance and durability, these ACL main bearings are a direct-fit solution for GM LS Gen III and Gen IV engines. Each set features a 270° oil groove for improved lubrication delivery and a precise .025mm (.001") undersize dimension for accurate crankshaft clearance during rebuilds. Accurate Fit: Designed specifically for GM LS Gen III-IV crank journals for reliable alignment and bearing life. 270° Oil Groove: Enhanced oil flow around the main journals to reduce friction and protect against scoring under high-load conditions. .025mm Undersize: Precise machining allowance for corrected crank journals — ideal for engines requiring minimal undersize bearings. Coated Surface: Advanced coating improves wear resistance, break-in, and tolerance to occasional debris or transient lubrication issues. Durability & Performance: Built to meet OEM specifications and withstand the demands of street, towing, and performance applications. Choose ACL main bearings when rebuilding or upgrading your LS engine to ensure dependable lubrication, accurate clearances, and long service life. Always check fitment and clearances per engine build specifications before installation.