ACL Bearings 4M2737H-.25 Race Series Main Bearing Set Undersize - 0.25mm

The ACL Bearings 4M2737H-.25 is a high-performance main bearing set from the Race Series lineup, designed specifically for Nissan VG30DE and VG30DETT 3.0L V6 engines. This 0.25mm (0.010") undersize bearing set is engineered for crankshafts that have been machined undersize during performance rebuilds or reconditioning.

Race Series Performance Features:

• Tri-metal construction designed to withstand extreme RPM conditions, high stress loads, and elevated temperatures
• High-strength overlay plate with reduced thickness for superior fatigue resistance and durability
• Hardened steel backing maintains crush under high loads and temperatures for secure bearing retention
• 3/4 groove design optimizes bearing load carrying capacity while ensuring proper oil flow to connecting rod bearings
• Increased crush and tighter wall tolerances for improved seating and consistent clearances
• Large chamfers accommodate larger crankshaft fillets common in performance applications
• Increased eccentricity compensates for bore distortion at high RPM and assists in hydrodynamic oil film formation
• Elimination of flash plating on bearing backs improves heat transfer and maximizes grip in housing

ACL Race Series bearings are manufactured to exacting tolerances with exceptional wall thickness accuracy, making them the top choice among professional engine builders. These bearings deliver the perfect balance of strength and forgiveness, performing reliably in both street machines and extreme racing applications. Whether you're building a high-boost turbocharged engine or a high-RPM naturally aspirated setup, ACL Race Series bearings provide the durability and performance needed to prevent premature bearing failure and costly engine damage.