ACL Bearings 4B1276P-10 Connecting Rod Bearing Set Undersize - 010

The ACL Bearings 4B1276P-10 is a high-performance connecting rod bearing set engineered for precision rebuilds using crankshafts ground .010 inches undersize. Part of the ACL Race Series lineup, these bearings feature advanced trimetal construction designed to withstand the demanding conditions of high-performance and racing applications.

Key Features:

• Trimetal construction with high-strength overlay plate and reduced thickness for improved fatigue resistance
• Hardened steel backing on all rod bearings to enhance lining support and retention in the housing
• Elimination of flash plating on bearing backs to improve heat transfer and maximize grip between bearing and housing
• Increased eccentricity to compensate for bore distortion at high RPM and assist in hydrodynamic oil film formation
• Tight, consistent wall tolerances to help maintain precise clearances
• Enlarged ID chamfers on bearing edges where required to accommodate large fillet radii on performance crankshafts
• .010" undersize specification for use with reground crankshaft journals

ACL Race Series bearings are extensively used in motorsports applications ranging from sport compact drift racing to NASCAR, IHRA, and NHRA competition. These bearings deliver the unique combination of design, metallurgy, and engineering that drivers and engine builders expect from premium performance engine components.