ACL Bearings 5M829H-01 Race Series Main Bearing Set Big Block Chevy Oversize - 001

The ACL Bearings 5M829H-01 is a high-performance Race Series main bearing set engineered for Big Block Chevy engines including 366, 396, 402, 427, and 454 cubic inch applications.

These bearings utilize multi-layered tri-metal copper alloy construction that combines high strength with excellent seizure resistance. The design features a steel backing plate for structural integrity, covered by a copper intermediate layer for improved load distribution, topped with a specialized overlay material engineered for extreme performance conditions. This construction is manufactured to exact tolerances ensuring reliable fit and consistent bearing clearances throughout the engine's operating range.

Race-Engineered Features:

• High-strength overlay plate with reduced thickness for improved fatigue properties
• Increased eccentricity to compensate for bore distortion at high RPM and assist hydrodynamic oil film formation
• Extended oil grooves to optimize bearing load-carrying surface area and oil flow to connecting rod bearings
• Enlarged chamfers for additional clearance when running performance crankshafts with large fillet radii
• Increased crush for superior bearing retention in the housing
• Elimination of flash plating on bearing backs to improve heat transfer and maximize housing grip

ACL Race Series bearings are designed to withstand higher RPM conditions and the extreme demands of racing and high-performance street applications. They deliver reduced power loss through optimized oil clearances while maintaining reliable lubrication even under punishing conditions. These bearings are the top choice of professional engine builders who demand precision quality control backed by decades of metallurgical expertise and racing experience.