ACL Bearings 1B1665HXD-STD Race Series Rod Bearing Set with Dowel Hole

The ACL Bearings 1B1665HXD-STD is a high-performance Race Series connecting rod bearing set engineered for demanding motorsports applications. This tri-metal performance bearing features .001" extra clearance (HX designation) on standard journal size and includes dowel hole locations (D designation) in the lower shell to match specific connecting rod cap configurations.

Race-Proven Features:

• Hardened steel backing on all rod bearings improves bearing lining support and assists with bearing retention in the housing
• High-strength overlay plate with reduced thickness provides improved fatigue properties for high-RPM applications
• Increased crush design delivers improved bearing retention and locks the bearing securely into the housing
• No flash plating on bearing backs improves heat transfer through the bearings and maximizes grip between bearing and housing
• Increased eccentricity compensates for bore distortion at high RPM and assists in hydrodynamic oil film formation
• Tight wall tolerances help maintain consistent oil clearances for reliable performance

ACL Race Series bearings are manufactured to exacting tolerances using a unique combination of advanced metallurgy and engineering. These bearings have proven themselves in championship-winning race engines across NASCAR, NHRA, IHRA, drift racing, and other professional motorsports competitions. The tri-metal construction provides excellent seizure resistance and high load capacity, making them suitable for high-performance street engines and all forms of racing applications.