King Engine Bearings MB 459SI1.5 Main Bearing Set Ford V-6 183 CID +1.5mm Oversize

The King Engine Bearings MB 459SI1.5 is a complete main bearing set designed for the Ford V-6 183 cubic inch engine. This set is offered in a +1.5mm oversize specification, making it well-suited for engine rebuilds where the crankshaft journals have been machined beyond standard dimensions.

This bearing set is manufactured using King's SI bi-metal material, which combines an aluminum alloy base with 2.5–3% silicon content for enhanced strength and wear resistance. The SI series is a fully lead-free OE replacement bearing material, meeting modern environmental standards without sacrificing performance.

Key Features:

• SI Bi-Metal Construction — Aluminum-silicon alloy overlay on a high-strength steel backing for durability and reliable oil film retention
• +1.5mm Oversize — Engineered for use with crankshafts that have been reground to the 1.5mm undersize specification
• Lead-Free Design — Environmentally responsible formulation that meets modern safety and regulatory standards
• 4 Pairs Included — Complete main bearing set with upper and lower shells for all main journals
• Ideal for Medium-Load Engines — Especially suited for engines equipped with nodular cast iron crankshafts
• OE Replacement Grade — Designed to meet or exceed original equipment specifications for reliable street and light-performance use

The King SI series is a trusted choice for professional engine builders and rebuilders seeking a quality, lead-free main bearing solution for the Ford 3.0L V-6 (183 CID) engine platform.