Main Bearing Set - BBC

The King Bearings Main Bearing Set for Big Block Chevy engines is designed for builders and engine rebuilders who prioritize reliability under extreme loads and sustained RPM. This set is ideal for those restoring classic 427 or 454 engines or constructing high-performance street or competition engines, as it serves as the critical foundation for crankshaft support.

Manufactured using premium copper-lead composite construction, these bearings feature advanced surface coatings that can handle the high bearing loads typical of big block applications. The MB 556SI 010 designation indicates specific sizing and material composition optimized for BBC journal diameters and oil clearances. The precision-engineered contact surfaces promote consistent oil film strength, reduce friction losses, and enhance load-carrying capacity across various engine scenarios.

This main bearing set is essential for anyone undertaking a BBC engine rebuild, whether for vintage muscle car restoration, street performance, or competition use. Proper installation requires professional honing and clearance verification to ensure optimal performance and longevity of the engine.