ACL Bearings 6B7986-040 Connecting Rod Bearing Set Undersize - 0.040

The ACL Bearings 6B7986-040 is a high-performance connecting rod bearing set designed for 0.040" undersize crankshaft journals. This precision-engineered bearing set delivers the durability and reliability needed for demanding engine builds, from street performance to racing applications.

Advanced Trimetal Construction:

• High-strength steel backing for superior bearing support and retention in the housing
• Copper-lead intermediate layer provides excellent load-carrying capacity and fatigue resistance
• Thin overlay plate with reduced thickness for improved fatigue properties and conformability
• Elimination of flash plating on bearing backs improves heat transfer and maximizes grip in the housing

Performance Features:

• 0.040" undersize specification for machined crankshafts
• Increased crush for improved bearing retention under high-load conditions
• Increased eccentricity compensates for bore distortion at high RPM and assists hydrodynamic oil film formation
• Tight, consistent wall tolerances help maintain precise bearing clearances
• Enlarged chamfers on bearing edges accommodate performance crankshafts with large fillet radii

ACL bearings are engineered with proven metallurgy and precision manufacturing to withstand the extreme demands of high-performance and racing engines. Whether building a street machine or competition engine, ACL connecting rod bearings provide the protection and durability required for reliable operation under stress.