King Engine Bearings MB 480SI 010 SI-Series Main Bearing Set Buick V6 .010 Undersize

The King Engine Bearings MB 480SI 010 is an OE-replacement crankshaft main bearing set engineered for Buick V6 engines. This set is machined to a .010-inch undersize specification, making it the ideal choice for engine rebuilds where the crankshaft journals have been reground to restore proper clearances.

These bearings feature King's proven SI-Series bi-metal construction, which combines an aluminum base alloy with 2.5–3% silicon content bonded to a steel backing. This composition delivers excellent strength and wear resistance while serving as a lead-free OE replacement—a modern, environmentally responsible alternative to traditional tri-metal bearings.

Key Features:

• SI-Series bi-metal construction: aluminum-silicon alloy on steel backing
• .010-inch undersize for reground crankshaft applications
• Lead-free formulation — modern OE-grade replacement
• Optimized for medium-load engines with nodular cast iron crankshafts
• Precision manufactured to strict dimensional tolerances

King Engine Bearings has been a trusted name in precision engine bearings since 1960, supplying bearings for automotive, light and heavy-duty truck, marine, aviation, and standby power applications. Every King bearing is manufactured to exacting quality standards to ensure reliable performance in both street and rebuild applications.