Perfect Circle CB663HN10 H-Series Connecting Rod Bearing Undersize - 010

The Perfect Circle CB663HN10 is a high-performance H-Series connecting rod bearing featuring .010" undersize dimensions for tighter crankshaft clearances. Originally developed for NASCAR racing applications, this bearing is engineered to meet the demanding requirements of all types of competition and high-performance engines.

Key Features:

• Tri-metal TM-77 bearing material construction for superior durability
• Medium level of eccentricity with high crush factor for optimal oil retention
• Hardened steel back with thin overlay for enhanced strength
• Narrowed design provides greater crankshaft fillet clearance
• Enlarged chamfers accommodate oversize crankshaft fillets
• Manufactured without flash plating for improved seating and contact
• .010" (.25mm) crankshaft undersize specification

These H-Series bearings are specifically recommended for engines operating in medium to high RPM ranges and for crankshafts with oversize fillets. The narrowed profile and enlarged chamfers make them ideal for performance builds where standard bearings provide insufficient fillet clearance. Sold individually to allow precise matching and clearance control during engine assembly.