King Engine Bearings MB557SI Main Bearing Set for GM Small Block - V8

The King Engine Bearings MB557SI is a precision-engineered main bearing set designed for General Motors small block V8 engines, including 262, 267, 302, 307, 327, and 350 cubic inch displacements. This complete main bearing set provides the critical interface between your engine block and crankshaft, ensuring proper oil clearance and reliable engine operation.

Construction and Material:

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 enhanced wear resistance and durability. This material specification makes the MB557SI bearings ideal for medium-load engine applications and particularly well-suited for use with nodular cast iron crankshafts commonly found in GM small block engines.

Key Features:

• Bi-metal silicon aluminum construction for excellent wear characteristics
• Optimized for medium-load engine applications
• Compatible with nodular cast iron crankshafts
• Precision manufactured to OEM specifications
• Complete main bearing set for thorough engine rebuild

King Engine Bearings is a trusted name in performance and replacement engine bearings, known for their precision manufacturing and quality control standards. This bearing set is an excellent choice for engine rebuilds, performance upgrades, or restoration projects involving classic and modern GM small block engines.