ACL Bearings 4B4565PO/S2-.50 Performance Connecting Rod Bearing Set Undersize - 0.50mm

The ACL Bearings 4B4565PO/S2-.50 is a complete connecting rod (conrod) bearing set engineered for high-performance and competition engine rebuilds. Manufactured to ACL's exacting tolerances, this set is ground to a 0.50mm undersize specification, making it ideal for use with reconditioned or reground connecting rod journals.

ACL's Performance Series (PO) bearings feature a tri-metal construction with a polymer overlay, delivering superior wear resistance, conformability, and fatigue strength compared to standard OEM-style bearings. The polymer overlay surface is designed to embed microscopic contaminants and compensate for minor surface irregularities, protecting the engine during critical break-in periods and under sustained high-load operation.

Key Features:

• Polymer Overlay (PO): Advanced surface coating for improved break-in protection and long-term durability
• 0.50mm Undersize: Precision ground for use with reground or remanufactured crankshaft rod journals
• Tri-Metal Construction: Steel-backed with copper-lead or aluminum alloy lining for superior load capacity
• High Fatigue Strength: Engineered to withstand elevated loads in performance and competition applications
• Consistent Tolerances: Manufactured to tight dimensional specifications for proper oil clearance and reliable performance
• Complete Set: Includes all connecting rod bearings required for the engine application

ACL Bearings are a trusted choice among professional engine builders, motorsport teams, and performance enthusiasts worldwide. The 4B4565PO/S2-.50 is a direct replacement for worn or damaged conrod bearings in supported engine applications, and is suitable for street performance, track, and endurance racing builds.