ACL Bearings 4B1686-030 High Performance Connecting Rod Bearing Set Undersize - 0.030

The ACL Bearings 4B1686-030 is a high-performance connecting rod bearing set designed for demanding engine builds. This 0.030" undersize bearing set is engineered for engines with reground crankshafts, providing precise fitment and optimal oil clearances for performance applications.

Advanced Trimetal Construction:

• Hardened steel backing provides superior crush resistance under extreme loads and high temperatures
• High-strength overlay plate with reduced thickness delivers improved fatigue resistance
• Premium bearing material composition ensures durability in high-RPM conditions
• Tight wall tolerances help maintain consistent bearing clearances throughout the engine

Performance Features:

• Enlarged chamfers accommodate larger crankshaft fillet radiuses common in performance cranks
• Optimized oil groove design maximizes load-carrying surface area while maintaining proper oil flow
• Increased crush for improved bearing retention and heat dissipation
• Race-proven metallurgy capable of withstanding high stress loads and elevated operating temperatures

ACL Race Series bearings are trusted by engine builders in motorsports applications ranging from sport compact racing to professional drag racing and road racing. These connecting rod bearings deliver the reliability and precision required for high-performance street, strip, and track engines.