ACL Bearings 5M1219HX-STD Race Series Main Bearing Set Standard Size

The ACL Race Series 5M1219HX-STD main bearing set is engineered for high-performance Mitsubishi 4G63 and 4G64 engines. Featuring tri-metal construction with a hardened steel backing, these bearings are designed to withstand high RPM conditions, extreme stress loads, and elevated operating temperatures in racing applications.

Key Features:

• HX Series design provides .0005" thinner bearing per half for .001" total extra clearance on standard cranks
• Tri-metal construction with hardened steel backing for improved support and bearing retention
• Large chamfers accommodate larger crankshaft fillets on performance cranks
• 3/4 groove design optimizes oil supply and maximizes load carrying capacity
• Increased crush and tighter wall tolerances ensure proper bearing seating
• Reduced overlay thickness for enhanced fatigue strength
• Flash plating eliminated to maximize heat transfer and bearing retention
• Bearing material: F780 tri-metal
• Includes upper and lower bearing halves

ACL Race Series bearings are manufactured to exacting micron-level tolerances with precision measurement systems ensuring consistent wall thickness and crush characteristics. These bearings are trusted components in race engines across motorsports, from sport compact drift racing to NASCAR and NHRA competitions. Note: Thrust washers sold separately.