King Engine Bearings MB5745SI0.75 Bi-Metal Main Bearing Set Oversize - 0.75mm

The King Engine Bearings MB5745SI0.75 is a +0.75mm oversized bi-metal main bearing set designed for the Subaru FA20 and FB20 boxer engines. This set is the ideal solution for engine rebuilds where the crankshaft journals have been machined undersize, requiring oversized bearings to restore proper clearances and oil film thickness.

Constructed using King's aluminum-silicon (SI) bi-metal material, these bearings are lead-free and environmentally safe, making them suitable for low- to heavy-load engine applications. The aluminum-based composite offers excellent conformability and corrosion resistance while delivering reliable performance for both street and performance builds.

Key Features:

• +0.75mm oversized — designed for use with crankshafts that have been ground 0.75mm undersize
• Bi-metal aluminum-silicon (SI) construction — lead-free, environmentally safe material for dependable performance
• OE replacement design — restores factory-spec oil clearances on rebuilt engines
• Bull's Eye Tolerance™ technology — King's proprietary manufacturing process combining precision machining, overplating, and real-time wall thickness monitoring for tight dimensional accuracy
• Passes rigorous multi-checkpoint quality control during production
• Compatible with nodular cast iron crankshafts

Specifications:

• Crankshaft Journal Diameter: 67.983–68.009 mm
• Housing Diameter: up to 73.038 mm
• Max Wall Thickness: 2.512 mm
• Max Length: 17.478 mm
• Quantity: 5 pairs (10 pieces total)
• Size: +0.75mm Oversize
• Material: Bi-Metal Aluminum Silicon (SI)

King Engine Bearings has specialized exclusively in engine bearings since 1960, supplying the aviation, racing, and automotive aftermarket industries worldwide. The SI series is an excellent OE-replacement choice for FA20/FB20 engine rebuilds requiring oversized main bearings.