ACL Bearings 4B1012-STD Connecting Rod Bearing Set Standard Size

The ACL Bearings 4B1012-STD is a high-performance connecting rod bearing set designed for demanding automotive applications. ACL bearings are manufactured using precision tri-metal construction, combining advanced metallurgy with tight tolerance machining to deliver reliable performance in both street and racing engines.

Key Features:

• Tri-metal construction with high-strength overlay plate for improved fatigue resistance
• Hardened steel backing on all rod bearings for enhanced support and retention
• Standard size (STD) for original equipment crankshaft journals
• Increased crush design for superior bearing retention in the housing
• Elimination of flash plating on bearing backs to maximize heat transfer and grip
• Tight wall thickness tolerances to help maintain consistent bearing clearances
• Complete set includes all bearing halves required for installation

ACL Race Series bearings are engineered to withstand higher RPM conditions and are trusted by engine builders worldwide. The precision manufacturing process ensures accurate wall thickness and crush characteristics, providing reliable fitment and consistent performance. These bearings feature increased eccentricity to compensate for bore distortion at high RPM and assist in the formation of hydrodynamic oil films, making them suitable for both performance rebuilds and race applications.