ACL Bearings 1B743H-20 Race Series Rod Bearing Set .020 Undersize Chevrolet Big Block V8

The ACL Bearings 1B743H-20 is a high-performance connecting rod bearing set designed specifically for Chevrolet big block V8 engines, including 396, 402, 427, and 454 cubic inch applications. This bearing set features .020 inch undersize dimensions for use with reground crankshafts, making it ideal for engine rebuilds and performance builds.

Race Series Performance Features:

• Tri-metal construction with high-strength steel backing for superior durability
• Reduced overlay thickness for improved fatigue resistance under extreme conditions
• Hardened steel backs on all rod bearings improve lining support and bearing retention
• Increased bearing eccentricity compensates for bore distortion at high RPM operation
• Elimination of flash plating on backing improves heat transfer and maximizes grip in housing
• Tight, consistent wall tolerances help maintain precise clearances
• Enlarged chamfers accommodate large fillet radius on performance crankshafts

ACL Race Series bearings are engineered for extreme endurance and are trusted by professional engine builders worldwide. These bearings deliver the metallurgical strength and design precision needed for high-RPM, high-boost applications where fatigue and stress wear are critical concerns. Suitable for racing, performance street builds, and demanding motorsports applications.