ACL Bearings 6B4500A-.25 Performance Connecting Rod Bearing Set Undersize - 25mm

The ACL Bearings 6B4500A-.25 is a high-performance connecting rod bearing set designed for precision engine rebuilds where crankshaft journals have been machined .25mm (0.010") undersize. Part of ACL's Race Series lineup, these bearings bring race-tested durability and advanced metallurgy to demanding performance applications.

Key Features:

• Trimetal copper alloy construction for superior strength and seizure resistance
• .25mm (.010") undersize specification for machined crankshaft rod journals
• Hardened steel backing for improved bearing support and retention under extreme conditions
• Elimination of flash plating on bearing backs improves heat transfer and maximizes grip in housing
• Manufactured to exacting tolerances for optimal oil film formation and reduced metal-to-metal contact
• Designed for 6-cylinder engine applications

ACL Race Series bearings are recognized throughout the motorsports world, with proven performance in engines from sport compact drift racing to NASCAR, IHRA, and NHRA competitions. The unique combination of design, metallurgy, and engineering provides these bearings with the endurance and capability to perform under high loads, elevated RPMs, and extreme operating conditions where standard bearings cannot.