King Engine Bearings MB5505SI050 SI-Series Main Bearing Set Ford Oversize - V8 351ci 5.8L 400ci 6.6L 050

The King Engine Bearings MB5505SI050 is a complete SI-Series crankshaft main bearing set engineered for Ford V8 engines, including the 351ci (5.8L) and 400ci (6.6L) 16-valve OHV applications. This set is supplied in a 0.50mm oversize (050) specification, making it the correct choice for engines with reground or worn crankshaft journals requiring the next oversize fit.

King's SI-Series bearings use a bi-metal silicon aluminum construction—an aluminum-based material strengthened with 2.5–3% silicon content. This alloy delivers excellent fatigue resistance and conformability, making it ideally suited for medium-load engines and vehicles equipped with nodular cast iron crankshafts. The silicon aluminum material provides reliable performance for OE replacement and standard engine rebuilding applications.

Key Features:

• Bi-metal silicon aluminum construction with 2.5–3% silicon content for strength and conformability
• Designed for medium-load engines and nodular cast iron crankshafts
• 0.50mm oversize (050) for use with reground crankshaft journals
• Recommended for OE replacement and aftermarket gasoline engine rebuilding
• Suitable for performance engines equipped with factory crankshafts
• Manufactured to precise wall thickness tolerances for proper oil clearance

King Engine Bearings has specialized exclusively in engine bearings since 1960, producing a comprehensive range of main, rod, thrust, and cam bearings for automotive, truck, marine, and performance applications. The MB5505SI050 is a trusted solution for professional engine rebuilders and DIY mechanics restoring Ford big-block V8 powerplants to factory specifications.