ACL Bearings 4B4390H-.25 Race Series High Performance Connecting Rod Bearings

ACL Race Series connecting rod bearings are engineered for high-performance and racing applications where reliability and durability under extreme conditions are paramount. These bearings feature advanced metallurgy and precision manufacturing to handle increased loads, higher RPMs, and elevated temperatures common in modified and competition engines.

Key Features:

• Race Series construction designed for high-performance and motorsport applications
• 0.25mm undersize for crankshaft journal refinishing and precision clearance control
• Premium bearing material optimized for strength and heat dissipation
• Precision manufacturing ensures consistent wall thickness and proper oil clearances
• Enhanced fatigue resistance for demanding operating conditions
• Compatible with high-output engines running elevated cylinder pressures

ACL Race Series bearings are the choice of engine builders and racers who demand maximum reliability and performance. The undersize specification allows proper fitment on reground crankshafts while maintaining optimal bearing clearances for high-performance applications.