ACL Bearings 5M1144HX-STD Race Series Main Bearing Set Standard Size with Extra Clearance

ACL Race Series main bearings are engineered for high performance race engines, combining advanced design, metallurgy, and engineering to deliver championship-level reliability. The 5M1144HX-STD is designed for Mitsubishi 4G63 engines from 1983-1992, featuring standard size dimensions with an extra 0.001 inch oil clearance compared to standard H-series bearings.

Key Features:

• Trimetal construction with lead, tin, copper, and nickel for superior strength and seizure resistance
• High strength overlay plate with reduced thickness for improved fatigue properties
• Increased crush for improved bearing retention in the housing
• Elimination of flash plating on bearing backs to improve heat transfer and maximize grip
• Increased eccentricity to compensate for bore distortion at high RPM
• 3/4 grooved design to optimize bearing load carrying surface area and oil flow
• F780 bearing material with precise tolerances

Designed to withstand higher RPM conditions, these main bearings are ideal for performance street machines, racing applications, and engine builds requiring maximum reliability under extreme loads. The HX designation indicates wall thickness is 0.0005 inch thinner than standard H-series bearings, providing optimal oil clearance for performance applications.