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

ACL Main Bearings for GM LS Gen III-IV — 270° Oil Groove, .025mm Undersize Brand: ACL High-performance main bearing set engineered for GM LS Gen III and Gen IV engines. These ACL bearings feature a 270° oil groove for improved oil flow and pressure control, and are manufactured at .025mm (0.001") undersize to fit engines requiring a slight journal reduction. Key Features Precision Fit: .025mm / 0.001" undersize for accurate journal clearance and reliable installation. 270° Oil Groove: Enhanced oil distribution around the crank journals to reduce friction and improve lubrication under high load. High-Quality Materials: Durable bearing alloys designed to resist wear, fatigue and maintain oil film integrity. OEM Compatibility: Direct replacement for GM LS Gen III and Gen IV main bearing applications. Performance Ready: Ideal for rebuilt, high-mileage or performance engines where precise clearances and improved oiling are required. Why Choose ACL ACL is trusted by builders and technicians for consistent tolerances and reliable performance. These bearings help protect crankshafts, extend engine life, and support sustained high-RPM operation. Fitment: GM LS Gen III & Gen IV engines. Confirm journal size and required undersize before ordering.