Main Bearing Set Coated SBC w/400 Mains

The KING BEARINGS Main Bearing Set Coated SBC with 400 Mains (MB 509XPC) is a precision engine component designed for small block Chevy applications requiring robust bearing support with enhanced durability. This standard-coated bearing kit provides the foundation for reliable engine performance in both street and high-performance builds where bearing load capacity and surface protection are critical.

KING BEARINGS bearings are engineered to exacting tolerances and incorporate advanced coatings that reduce friction and extend service life under varying load conditions. The XP coating formulation provides superior corrosion resistance and improved wear characteristics compared to uncoated alternatives, making this set suitable for both traditional gasoline engines and those subjected to extended storage or variable operating conditions. The 400 mains designation indicates this bearing set is optimized for crankshaft journals in that displacement range, ensuring proper clearance and load distribution across the bearing surface.

This bearing kit addresses the needs of engine builders and enthusiasts performing small block Chevy rebuilds, whether for original restoration, performance upgrades, or long-term reliability improvements. Proper bearing selection is fundamental to engine longevity; undersized or mismatched bearings compromise oil flow and accelerate wear, while correctly specified bearing sets like this one ensure optimal crankshaft support and extended engine life. The coated construction adds an extra margin of protection during break-in and under transient operating conditions.

KING BEARINGS occupies a solid position in the OEM and rebuild market, with a reputation for consistent dimensional accuracy and surface quality. This bearing set is a foundational component—selecting the correct specification and coating protection at the outset prevents costlier failures later in the engine's service life.