HP Main Bearing Set

The HP Main Bearing Set by King Bearings is engineered specifically for high-performance Mopar 426 Hemi and RB-series engines, delivering the precision clearances and load-carrying capacity demanded by serious enthusiasts and race builders. These main bearings form the critical foundation of any engine rebuild, supporting the crankshaft while managing combustion pressures and rotational forces that increase dramatically under boost, nitrous, or high-RPM operation. If you're restoring a classic Mopar muscle car or building a performance stroker, a quality main bearing set directly impacts engine longevity, oil film stability, and overall reliability.

King Bearings' HP specification achieves tighter tolerances and superior material composition compared to standard OEM replacements, with advanced copper-lead overlay that resists bearing wear under sustained high load and temperature extremes. The set maintains proper journal clearance geometry to ensure consistent oil flow between the crankshaft and bearing saddle—critical for protecting against scuffing and spalling during peak horsepower events. Standard sizing eliminates the need for custom grinding, making installation straightforward during an in-frame or complete engine teardown while guaranteeing fitment to factory block specs.

Builders targeting 500+ horsepower from Hemi or RB platforms—whether through stroking, elevated compression, or forced induction—should prioritize HP-rated main bearings to protect against crankshaft deflection and bearing failure. This set is ideal for both street-strip hybrids and dedicated race engines where torque multiplication and sustained RPM operation demand uncompromising bearing performance. Installation requires proper sizing verification and torque sequence discipline; always follow factory or machine shop recommendations when assembling the crankshaft saddle to ensure optimal clamping load and bearing preload.