BBC Main Bearing Set Narrowed

The ACL BEARINGS BBC Main Bearing Set Narrowed (5M829HN-STD) is a precision-engineered bearing kit designed for big block Chevy engines requiring tight tolerances and reliable bottom-end support. Built for serious enthusiasts and engine builders, this main bearing set delivers the stability your engine demands under sustained load and high RPM operation. Whether you're restoring a classic muscle car, building a competition engine, or upgrading a street application, proper main bearing selection is critical to longevity and performance.

This Race Series main bearing set features a narrowed design engineered to fit tighter block dimensions while maintaining critical oil clearance specifications. ACL's standard-grade construction provides excellent load-carrying capacity and thermal stability, essential for controlling crankshaft deflection and preventing catastrophic bearing wear. The narrowed configuration reduces axial end play and improves bearing contact pressure distribution, resulting in reduced vibration and enhanced crank stability. Proper bearing installation with correct torque specifications and adequate pre-oiling ensures maximum service life and engine reliability across a wide range of operating conditions.

Engine builders, machine shops, and dedicated enthusiasts who understand the importance of quality bottom-end components will recognize the value of ACL's proven bearing technology. The BBC Main Bearing Set Narrowed is specifically engineered for big block Chevy blocks with narrowed clearance requirements and pairs seamlessly with compatible crankshafts during assembly. Installation requires precision alignment, proper cleaning of all bearing surfaces, and adherence to manufacturer torque specifications. This is not a bargain-basement component—it's a professional-grade bearing set for builders who refuse to compromise on engine reliability and performance longevity.