ACL Bearings 4B1630-.25 Oversized Rod Bearing Set for Nissan - 0.25mm

The ACL Bearings 4B1630-.25 is a high-performance connecting rod bearing set engineered for Nissan CA16, CA18, CA20, and CD17 engines. This 0.25mm oversized bearing set is designed for rebuilt engines with machined crankshafts, providing precise fitment and optimal oil clearances for performance and racing applications.

Race Series Performance Features:

• Tri-metal construction with hardened steel backing to withstand high RPM conditions, high stress loads, and extreme temperatures
• Large chamfer design accommodates larger crankshaft fillets commonly found in performance builds
• 3/4 groove pattern provides optimum oil supply to connecting rods while maximizing load carrying capacity
• Increased crush and tighter wall tolerances ensure superior bearing retention and seating
• High-strength overlay with reduced thickness for improved fatigue strength and durability
• Hardened steel backing maintains crush integrity under high loads and temperatures
• Identical bearing halves simplify installation and inventory management

ACL Race Series bearings feature F781 bearing material and are manufactured to exacting ISO-certified standards. These bearings are trusted by professional engine builders and racers worldwide for their quality, consistency, and ability to perform in extreme conditions where standard bearings fail. The 0.25mm oversize is commonly used when crankshafts are machined to restore proper oil clearances during performance engine rebuilds.