ACL Bearings 4B745A-20 Standard Connecting Rod Bearing Set

The ACL Bearings 4B745A-20 is a standard size connecting rod bearing set engineered for reliable performance in engine rebuilds and performance applications. ACL Race Series bearings are recognized throughout the motorsports industry for their precision manufacturing and race-proven durability.

Advanced Trimetal Construction:

• High-strength lead-tin-copper overlay plate with reduced thickness for improved fatigue resistance
• Hardened steel backing enhances bearing lining support and retention in the housing
• Nickel barrier layer provides separation between overlay and lining materials
• Copper-lead-tin lining delivers excellent fatigue strength while remaining deformable

Performance Features:

• Manufactured to exacting tolerances with precise wall thickness accuracy for consistent clearances
• Increased crush factor improves bearing retention and locks bearings securely into housing
• No flash plating on bearing backs maximizes heat transfer and improves grip between bearing and housing
• Increased eccentricity compensates for bore distortion at high RPM and assists in hydrodynamic oil film formation
• Enlarged ID chamfers on bearing edges accommodate performance crankshafts

ACL bearings are designed to withstand higher RPM conditions and demanding operating environments. The unique combination of precision engineering, advanced metallurgy, and race-tested design makes these bearings suitable for street performance, racing, and professional engine builds. Proper measurement of bearing clearances is essential before installation to ensure optimal fit and performance.