King Engine Bearings MB556HPN030 Main Bearing Set Chevrolet Gen IV V VI - 396-502

The King Engine Bearings MB556HPN030 is a high-performance main bearing set designed for Chevrolet Big Block 396–502 cubic inch engines spanning Gen IV, V, and VI configurations. Part of King's HP (High Performance) Series, this set is engineered for demanding street performance and racing applications where standard OEM bearings fall short.

King's HP Series bearings feature a tri-metal construction with a steel backing, copper-lead or aluminum-based intermediate layer, and a precision overlay — delivering superior load capacity, conformability, and durability under high-RPM and high-load conditions. The .030" undersize designation makes this set compatible with crankshafts that have been ground 0.030 inches under standard journal diameter.

Key Features:

• HP (High Performance / Racing Line) series tri-metal bearing construction
• 0.030" (030) undersize for reground crankshafts
• Designed for Chevrolet Big Block 396, 427, 454, 496, and 502 cubic inch engines
• Compatible with Gen IV, Gen V, and Gen VI Big Block Chevrolet block families
• Precision-machined to tight tolerances for optimal oil clearance and film strength
• Enhanced fatigue strength and wear resistance for performance and racing use
• Full main bearing set included

Whether building a street/strip muscle car or a dedicated racing engine, the King MB556HPN030 provides the reliability and performance needed to protect your Big Block Chevrolet crankshaft under extreme operating conditions.