ACL Bearings 4B1891-040 Connecting Rod Bearing Set Undersize - 0.040

The ACL Bearings 4B1891-040 is a precision-engineered connecting rod bearing set designed for 0.040 inch undersize crankshaft journals. This bearing set provides reliable performance for engines that have had their crankshafts machined to 0.040" undersize specifications during rebuilding or performance modifications.

Key Features:

• 0.040 inch (1.016mm) undersize for machined crankshaft journals
• Tri-metal construction with copper-lead alloy for superior strength and durability
• Steel backing provides excellent support and bearing retention
• Precision-machined to tight tolerances for consistent oil clearances
• High fatigue resistance for demanding operating conditions
• Excellent seizure resistance and conformability
• Complete bearing set includes all necessary bearing halves for connecting rods

ACL Bearings are manufactured to exacting specifications using advanced metallurgy and precision machining processes. These connecting rod bearings are designed for both performance rebuilds and standard replacement applications where the crankshaft has been ground to 0.040" undersize to restore proper journal dimensions.