Main Bearing Set BBM 426/440

The Main Bearing Set BBM 426/440 from King Bearings is engineered for high-performance Mopar engines, specifically the legendary 426 Hemi and RB-Series platforms. This bearing kit addresses the critical need for precision internal components in vintage and performance builds where factory tolerances may have drifted or where upgraded engine internals demand tighter specifications. Whether you're rebuilding a classic muscle car or restoring a competition engine, this bearing set provides the foundational support required for reliable, long-term operation.

This XP-series bearing set features a 0.001-inch undersize specification, designed to accommodate crank journals that have been machined or worn beyond standard tolerances while maintaining proper oil film thickness and load capacity. The coated construction enhances wear resistance and reduces friction during initial break-in, critical for engine longevity. King Bearings' design ensures consistent bore diameters and wall thickness across all journals, delivering the precision fit that modern engine building demands. The compact kit dimensions of 4.33 x 2.17 x 11.61 inches house all main bearing shells needed for a complete crank installation, weighing just 1.402 lbs for easy handling during assembly.

This bearing set is ideal for engine builders, restoration shops, and dedicated enthusiasts rebuilding 426 Hemi or RB-Series engines where original specifications no longer apply. The 0.001-inch undersize makes it particularly valuable when crank regrinding has been performed, ensuring a precision fit without the need for further machining. Installation is straightforward for experienced builders familiar with Mopar engine assembly—simply verify crank journal diameters match the undersize specification before installation. This kit represents the quality and reliability expected from King Bearings' OEM-grade manufacturing standards.