ACL Bearings 4B1730-040 Connecting Rod Bearing Set 0.040" Undersize

The ACL Bearings 4B1730-040 is a precision-engineered connecting rod bearing set designed for 0.040" undersize crankshaft journals. This set is manufactured using ACL's advanced tri-metal construction technology, combining durability with performance for engine rebuilds requiring undersized bearings due to crankshaft machining or wear.

Key Features:

• Tri-metal design with high-strength overlay plate and reduced thickness for improved fatigue resistance
• Hardened steel backing for enhanced support and bearing retention in the housing
• 0.040" (1.016mm) undersize specification for machined crankshaft journals
• Elimination of flash plating on backing to improve heat transfer and maximize grip
• Increased eccentricity to compensate for bore distortion at high RPM
• Copper-lead-tin alloy construction provides excellent load-carrying capacity
• Tight wall tolerances for consistent oil clearances

ACL connecting rod bearings are engineered with precision metallurgy to deliver reliable performance in both stock rebuilds and performance applications. The undersize specification requires proper measurement and clearance verification during installation to ensure optimal bearing life and engine protection.