King Engine Bearings MB5116SI Main Bearing Set Chrysler - 426CI/440CI V8

The King Engine Bearings MB5116SI is a premium SI-Series main bearing set engineered specifically for Chrysler 426CI and 440CI V8 OHV engines, including the legendary 426 Hemi and RB-Series V8 powerplants. This complete main bearing kit provides OE-replacement quality with race-proven performance enhancements.

Key Features:

• Silicon Alecular (SI) Bi-Metal Construction: Features a deep .012"-.015" layer of King's proprietary Alecular material—an exclusive alloy of aluminum, tin, copper, silicon, and other metals bonded to high-strength steel backing
• Bull's Eye Tolerance Technology: Precision-manufactured with industry-leading wall thickness tolerances of ±.0001", ensuring consistent bearing clearances and optimal oil film protection
• Superior Embedability: The thick Alecular layer provides excellent debris embedment capability, protecting crankshaft journals from contaminant damage
• Enhanced Durability: Silicon particles help smooth crank surface irregularities during operation, reducing friction and wear for extended bearing life
• Standard Size Bearings: Sold as a complete set for all main journal positions

King's SI-Series bearings are ideal for street performance, engine rebuilds, and racing applications using stock or nodular cast iron crankshafts. The unplated bi-metal design reduces wall thickness variance by up to 40% compared to traditional tri-metal bearings, while exceeding maximum peak load capacity requirements for automotive applications. King Engine Bearings has been the trusted choice of professional engine builders and racers since 1960, delivering precision-engineered bearing solutions tested in the most demanding motorsports environments.