King Engine Bearings MB5220SI1.25 Main Bearing Set Undersize Subaru - 1.25mm EJ20 EJ22 EJ25

The King Engine Bearings MB5220SI1.25 is a precision-engineered main bearing set designed for Subaru EJ20, EJ22, and EJ25 engines, including turbocharged variants. This set features a 1.25mm undersize specification, ideal for crankshafts that have been machined or require oversize bearings for proper clearance restoration.

Key Features:

• Bi-metal SI construction with aluminum base blended with 2.5-3% silicon for enhanced strength
• Lead-free, environmentally safe bearing material
• Designed for medium-load engines, particularly those with nodular cast iron crankshafts
• OE-replacement quality for stock engine rebuilds
• 5-pair complete main bearing set
• Thrust bearing positioned for #3 location
• 1.25mm undersize for machined crankshafts

King Engine Bearings has specialized in bearing manufacturing since 1960, producing high-quality engine bearings for automotive, marine, aviation, and racing applications. The SI-Series bearings are specifically engineered for aftermarket gasoline and diesel engine rebuilding, offering reliable performance with factory crankshafts. The lead-free aluminum-silicon alloy provides excellent embedability and durability for long-lasting engine protection.