ACL Bearings 8B684PO/S2-40 Connecting Rod Bearing Set Undersize - 040

The ACL Bearings 8B684PO/S2-40 is a precision-engineered connecting rod bearing set designed for demanding performance applications. This set features ACL's advanced tri-metal construction with a .040" undersize specification for reground crankshafts.

Tri-Metal Construction:

• High-strength steel backing for superior support and retention under extreme conditions
• Copper-lead-tin lining layer provides exceptional fatigue strength while remaining deformable
• Lead-tin-copper overlay with reduced thickness for improved fatigue resistance and seizure protection
• Nickel barrier layer prevents diffusion between the lining and overlay

Performance Features:

• Expertly made from premium materials engineered to exact specifications
• Proprietary tri-metal design delivers high strength and excellent load-carrying characteristics
• Enhanced heat dissipation through improved thermal transfer properties
• Exceptional wear resistance for extended service life
• Ideal for performance engines, rebuilds, and demanding operating conditions above casual driving

This bearing set is sold as a complete set for one engine and is designed to provide the durability and precision required for high-performance engine builds. The .040" undersize designation (indicated by the "-40" suffix) is specifically engineered for crankshafts that have been machined .040" under the standard journal diameter.