King Engine Bearings MB5766SI010 GM LS1/LS2/LS4/LS6 Si-Series Main Bearing Set Housing Bore +.010 Size .010 OS

The King Engine Bearings MB5766SI010 is an OE-replacement bi-metal main bearing set engineered for Chevrolet L20, LS1, LS2, LS4, and LS6 engines featuring a housing bore that is +.010" oversized. This set is purpose-built for engine rebuilds where the block has been line-honed to correct a worn or out-of-round housing bore, restoring proper bearing-to-journal clearance without the need for additional machining.

Constructed from King's proven SI-Series bi-metal Silicon Aluminum material, each bearing shell uses an aluminum base alloy strengthened with 2.5–3% silicon. This composition delivers excellent fatigue resistance and conformability, making it well suited for medium-load street and performance engines — especially those running nodular cast iron crankshafts. The SI material is also a lead-free formulation, meeting modern environmental and safety standards.

Key Features:

• Bi-metal Silicon Aluminum (SI-Series) construction — aluminum base with 2.5–3% silicon content
• Housing bore +.010" oversize diameter for use after block line-honing
• Crankshaft journal size: .010" oversized
• Includes 5 pairs of main bearing shells (complete set)
• Lead-free bearing material for improved safety and compliance
• Designed for medium-load engines and nodular cast iron crankshafts
• Manufactured to OE-replacement specifications
• All bearings produced in-house under strict multi-stage quality control

King Engine Bearings has specialized exclusively in engine bearings since 1960, and every bearing in the MB5766SI line is manufactured from concept through final inspection under one roof. The result is a consistent, precision-built replacement bearing trusted by engine builders for street rebuilds and performance applications alike.