King Engine Bearings CR4352SI030 SI-Series Engine Crankshaft Main Bearing Set 0.030" Undersize

The King Engine Bearings CR4352SI030 is a 0.030-inch undersize crankshaft main bearing set engineered for Chrysler and Jeep 2.5L (150CI) 8-valve engines. Part of King's trusted SI-Series, these bearings are manufactured to OEM specifications and designed for reliable performance in aftermarket engine rebuilding applications.

The SI-Series utilizes a bi-metal silicon aluminum construction, with an aluminum-based alloy strengthened by 2.5–3% silicon content. This material is optimized for medium-load engines and is particularly well-suited to applications with nodular cast iron crankshafts, offering excellent compatibility and surface performance during break-in and long-term operation.

Key Features:

• SI-Series Bi-Metal Construction: Silicon aluminum alloy provides reliable performance for medium-load OE-style applications
• 0.030" Undersize: Engineered for reground crankshaft journals turned 0.030 inches under standard diameter
• Nodular Cast Iron Crankshaft Compatible: Improved surface finish reduces microscopic ferrite peaks on nodular cast iron journals
• Optimized Oil Clearance: Precision tolerances help reduce wear, minimize operating noise, and extend engine life
• Direct OE Replacement: Manufactured to match original equipment specifications for accurate fit and function
• Precision Manufacturing: Produced entirely in-house by King for rigorous quality control throughout the production process

King Engine Bearings has specialized exclusively in engine bearings since 1960, supplying the automotive, light truck, marine, and performance markets with high-quality products built to exacting standards. The CR4352SI030 is a reliable choice for professional engine builders performing a complete overhaul or crankshaft regrind service.