ACL Bearings 5M1144H-.025 Race Series Main Bearing Set

The ACL Race Series 5M1144H-.025 main bearing set is engineered for high-performance Mitsubishi 4G63 and 4G64 engines, featuring a .025mm (.001") oversize for precision crankshaft clearance adjustment. This complete set includes 10 tri-metal main bearings designed to handle extreme RPM, high boost, and demanding racing conditions.

Key Features:

• Tri-metal construction with high-strength overlay plate and reduced thickness for superior fatigue resistance
• Hardened steel backing to maintain crush under high loads and extreme temperatures
• 3/4 groove design providing optimum oil supply to connecting rods while maximizing load-carrying surface area
• Increased crush and tighter wall tolerances for improved bearing retention and seating
• Enhanced eccentricity to compensate for bore distortion at high RPM and assist hydrodynamic oil film formation
• Elimination of flash plating on bearing backs for improved heat transfer and housing grip
• Large chamfers to accommodate aftermarket crankshafts with larger fillets

ACL Race Series bearings deliver the perfect balance of strength and durability for builds ranging from street performance to extreme competition applications. Whether you're building a high-horsepower street machine or a purpose-built race engine, these bearings provide the reliability and endurance required under harsh operating conditions.