King Engine Bearings MB5382SI SI-Series Main Bearing Set

The King Engine Bearings MB5382SI is a SI-Series main bearing set designed for Subaru EJ20, EJ22, and EJ25 engines, including turbocharged applications. This complete set includes 5 main bearings engineered for OE replacement and performance engine rebuilding applications using factory crankshafts.

Advanced Bi-Metal Construction:

• Aluminum-based material strengthened with 2.5-3% silicon for enhanced durability
• Bi-metal silicon aluminum construction bonded to high-strength steel backing
• Optimized for medium-load engines and nodular cast iron crankshafts
• Improved crankshaft finish reduces microscopic ferrite peaks on improperly ground or polished surfaces

Performance Benefits:

• Enhanced oil clearance design reduces wear and extends engine life
• Minimizes operating noise and vibration during operation
• Reduces excess oil flow for improved lubrication efficiency
• Direct replacement design with 1/2 groove upper bearing configuration
• Stock sizing for precise OE fitment

King Engine Bearings has specialized in premium bearing manufacturing since 1960, utilizing rigorous quality control standards and advanced materials to deliver professional-grade components for automotive, marine, and performance applications. Each bearing is manufactured in-house from concept through production to ensure consistent quality and reliability.