ACL Bearings 8B831A-40 Connecting Rod Bearing Set Undersize - 040

The ACL Bearings 8B831A-40 connecting rod bearing set is engineered for AMC and Jeep V8 engines, specifically the 390 and 401 cubic inch engines produced from 1968 to 1978. This set is designed for crankshafts machined to .040 inch (1.0mm) undersize journal dimensions, making it ideal for engine rebuilds with reground crankshafts.

Advanced Bearing Technology:

• Tri-metal construction with copper-lead-tin lining for superior fatigue strength and load-carrying capacity
• High-strength overlay plate with lead-tin-copper composition providing excellent seizure resistance and low friction operation
• Hardened steel backing for enhanced bearing support and improved retention in the connecting rod housing
• Nickel barrier layer separates the overlay from the lining to prevent diffusion and maintain bearing integrity

Performance Features:

• Engineered eccentricity compensates for bore distortion during high-speed operation
• Elimination of flash plating on the bearing back improves heat transfer and maximizes grip between bearing and housing
• Precision-manufactured to tight tolerances for consistent oil clearances throughout the engine
• Designed to withstand demanding operating conditions in performance and street applications

ACL Bearings are manufactured to exacting standards and offer reliable durability for both street-driven vehicles and performance builds. This complete connecting rod bearing set includes all bearings needed for one engine rebuild.