King Engine Bearings MB 459SI1.0 Main Bearing Set Ford V-6 183 +1.0mm Oversize

The King Engine Bearings MB 459SI1.0 is an OE-replacement main bearing set designed for the Ford 3.0L V-6 183 cubic inch engine. This set is sized at +1.0mm oversize, making it ideal for engine rebuilds where the crankshaft journals have been machined undersize to restore proper clearances.

Constructed using King's SI bi-metal bearing material, each bearing combines an aluminum base alloy with 2.5–3% silicon content for enhanced strength and wear resistance. This lead-free formulation makes the SI series a modern, environmentally conscious alternative to traditional tri-metal bearings while meeting or exceeding OEM performance standards.

Key Features:

• SI Bi-Metal Construction: Aluminum-silicon alloy on a high-strength steel backing for durability and conformability
• +1.0mm Oversize: Engineered for crankshafts that have been ground 1.0mm undersize during engine reconditioning
• Lead-Free Formula: Environmentally safe alternative to traditional lead-based bearing materials
• OE Replacement Grade: Designed as a direct replacement for factory main bearings
• Optimized for Medium-Load Engines: Particularly suited for engines equipped with nodular cast iron crankshafts
• Complete Set: Includes 4 pairs of main bearings to service the full engine block

King Engine Bearings has been a trusted name in precision engine bearings since 1960, supplying both OE replacement and high-performance bearing solutions to engine builders and rebuilders worldwide. The MB 459SI1.0 is the correct oversize selection for heavily worn or previously machined Ford V-6 183 engines requiring a full 1.0mm journal correction.