ACL Bearings 1B1663H-STD H-Series Connecting Rod Bearing

The ACL Bearings 1B1663H-STD is a high-performance H-Series connecting rod bearing designed for Small Block Chevy and Honda engine applications. This standard-size bearing features a journal diameter of 1.890" and 2.015", engineered to deliver exceptional reliability in medium to high RPM racing conditions.

Advanced Race-Proven Design:

• Hardened steel backing on rod bearings improves support and bearing retention in the housing
• High-strength overlay plate with reduced thickness for superior fatigue resistance
• Increased eccentricity compensates for bore distortion at high RPM and assists in hydrodynamic oil film formation
• Enlarged chamfers provide greater crankshaft fillet clearance for performance crankshafts
• Flash plating eliminated on bearing backs to improve heat transfer and maximize grip
• Tight, consistent wall tolerances help maintain precise clearances

H-Series Features:

• Medium level of eccentricity with high crush for improved retention
• Thin overlay construction optimized for racing applications
• Manufactured to micron-level tolerances for reliable fit and consistent performance
• Multi-layer construction provides high strength and excellent seizure resistance

ACL Race Series bearings are trusted by engine builders and racers worldwide, from sport compact drift racing to NASCAR, IHRA, and NHRA competitions. Sold individually (each). Ideal for engines running in medium to high RPM ranges with oversize crankshaft fillets.