ACL Bearings 4B1388P-STD High Performance Connecting Rod Bearing Set

The ACL Bearings 4B1388P-STD is a high-performance connecting rod bearing set engineered for demanding applications where reliability and durability are critical. Part of ACL's Race Series lineup, these bearings feature advanced trimetal construction and precision engineering to deliver superior performance in both street and competition engines.

Key Features:

• Trimetal construction with high-strength overlay plate featuring reduced thickness for improved fatigue resistance
• Hardened steel backing provides enhanced support and superior bearing retention in the housing
• Increased crush design improves bearing retention through higher radial contact pressures and heat dissipation
• Increased eccentricity compensates for bore distortion at high RPM and assists in hydrodynamic oil film formation
• No flash plating on bearing backs maximizes heat transfer and improves grip between bearing and housing
• Micron-tolerance machining ensures consistent wall thickness and crush for reliable fit and clearances
• Standard size (STD) for use with standard crankshaft journals

ACL Race Series bearings are manufactured to exacting standards and have proven themselves in motorsports applications ranging from sport compact drift racing to NASCAR, IHRA, and NHRA competitions. The unique combination of advanced materials, precision engineering, and race-proven design makes these bearings suitable for high-RPM conditions and performance engine builds.