King Engine Bearings MB4056SI Crankshaft Main Bearing Set

The King Engine Bearings MB4056SI is a precision-engineered crankshaft main bearing set designed for Ford 155 cubic inch (2.5L) V6 engines. This complete set includes 4 pairs of main bearings to support the crankshaft in the engine block.

SI Series Bi-Metal Construction:

King's SI (Silicon-Aluminum) series bearings feature a bi-metal design with an aluminum base blended with 2.5-3% silicon for enhanced strength and durability. This construction provides excellent load-bearing characteristics while maintaining proper oil clearances under operating temperatures. The bi-metal design is ideal for medium-load engines, particularly those using nodular cast iron crankshafts.

Key Features:

• Complete main bearing set with 4 pairs (standard size)
• Bi-metal aluminum-silicon construction for strength and wear resistance
• Engineered for Ford 155 cubic inch V6 engines
• Optimized for medium-load applications
• Compatible with nodular cast iron crankshafts
• Precision manufactured to OE specifications

King Engine Bearings maintains rigorous quality control standards, ensuring that every bearing meets exacting tolerances for reliable engine performance and longevity. Whether you're performing an engine rebuild or routine maintenance, these main bearings provide the quality and precision demanded by professional engine builders.