ACL Bearings 5M909H-20 Race Series Main Bearing Set Undersize - 020

The ACL Bearings 5M909H-20 Race Series Main Bearing Set is engineered for high-performance and racing applications requiring .020 inch crankshaft undersize bearings. Designed for Chevrolet small block engines with 2.100-inch housing bores, this 5-piece bearing set delivers the strength and durability demanded by performance builds.

Key Features:

• Multi-layered tri-metal copper alloy construction for high strength and excellent seizure resistance
• Precision machined to exact tolerances ensuring reliable fit and consistent clearances
• 3/4 groove design optimizes bearing load carrying surface area and oil flow
• Increased crush for improved bearing retention in high-RPM conditions
• Enhanced bearing eccentricity to compensate for bore distortion at high RPM
• Enlarged ID chamfers accommodate large fillet radius performance crankshafts
• No flash plating on bearing backs improves heat transfer and housing grip
• Tight consistent wall tolerances help maintain proper clearances

ACL Race Series bearings combine advanced metallurgy, precision engineering, and decades of racing experience to deliver reliable performance under extreme conditions. The .020 undersize specification allows for crankshaft regrinding while maintaining optimal bearing clearances. Set includes five main bearings for complete crankshaft installation.