King Engine Bearings MB556SI020 Main Bearing Set for Chevrolet Gen IV V VI - 396-502

The King Engine Bearings MB556SI020 main bearing set is precision-engineered for Chevrolet big block engines, including the legendary 396, 427, 454, and 502 cubic inch V8 motors spanning Generation IV, V, and VI platforms. This complete main bearing set provides the critical interface between your crankshaft and engine block, ensuring proper oil clearances and reliable operation.

Material Construction:

These bearings feature bi-metal construction with a silicon aluminum alloy composition. The aluminum-based bearing material is strengthened with 2.5-3% silicon content, providing an optimal balance of strength, embedability, and wear resistance. This material composition is specifically designed for medium load applications and performs exceptionally well with nodular cast iron crankshafts commonly found in these big block Chevrolet engines.

Key Features:

• Complete main bearing set for Chevrolet 396-502 cubic inch big block engines
• Bi-metal silicon aluminum construction for enhanced durability
• Designed for Gen IV, V, and VI big block platforms
• Optimized for medium load engines and nodular iron crankshafts
• Precision manufactured to OE specifications
• 0.020" oversize for crankshaft journals that have been machined undersize

King Engine Bearings is a trusted name in performance and racing engine components, offering bearing sets that meet the demands of both street and performance applications. The silicon aluminum alloy provides excellent conformability to accommodate minor surface imperfections while maintaining the strength needed for reliable operation.