ACL Bearings 4B1870-STD Connecting Rod Bearing Set Standard Size

The ACL Bearings 4B1870-STD is a standard size connecting rod bearing set engineered for high-performance and reliability. ACL Race-Series Connecting Rod Bearings bring race-tested durability, precision engineering, and state-of-the-art metallurgy featuring a trimetal design with a high-strength overlay plate with reduced thickness for improved fatigue resistance, backed by hardened steel for enhanced support and retention.

Hardened steel backs on all rod bearings improve the support of the bearing lining and assist with bearing retention in the housing. Elimination of flash plating on the back of the bearings improves heat transfer through the bearings and maximizes the grip between the bearings and its housing. Increased eccentricity compensates for bore distortion at high rpm and assists in the formation of hydrodynamic oil films.

The trimetal construction features a high-strength overlay plate with reduced thickness for improved fatigue properties. Tight consistent wall tolerances help maintain consistent clearances, while enlarged ID chamfers on bearing edges accommodate large fillet radius on performance crankshafts.

Key Features:

• Trimetal bearing design with hardened steel backing
• High-strength overlay plate for improved fatigue resistance
• Enhanced heat dissipation through optimized thermal transfer
• Increased crush for superior bearing retention
• Precision-engineered for consistent oil clearances
• Standard size (STD) for original journal dimensions
• Suitable for high-RPM performance applications

ACL Race Series performance engine bearings are recognized as a premier brand throughout the motorsports world, trusted by engine builders for both street and competition use.