King Engine Bearings MB4577SI0.5 SI-Series Main Bearing Set Oversize - 0.5mm

The King Engine Bearings MB4577SI0.5 is a precision-engineered main bearing set designed for professional engine rebuilding and performance applications. This SI-Series bearing features 0.5mm oversize dimensions for use with crankshafts that have been machined or require increased clearance specifications.

SI-Series Technology:

• K-788 aluminum-based material strengthened by 2.5-3% silicon for medium load engines and nodular cast iron crankshafts
• Improved crankshaft finish reduces microscopic ferrite peaks on improperly ground or polished nodular cast iron crankshafts
• Optimized oil clearance reduces wear and increases engine life while minimizing operating noise, vibration, and excess oil flow
• Precision tolerance control up to +/- 0.0001 inches ensures proper fitment and performance
• Lead-free construction for environmental safety

Applications:

King SI-Series main bearings are recommended for OE replacement applications, aftermarket gasoline or diesel engine rebuilding, and performance engines utilizing factory crankshafts. The 0.5mm oversize specification makes this bearing set ideal for engines with machined crankshaft journals requiring oversized bearings to restore proper clearances.

Each King bearing is manufactured under one roof using the highest quality materials and advanced engineering designs to ensure superior performance and complete customer satisfaction in automotive, marine, and performance engine applications.