King Engine Bearings Main Bearing Set

Fits Most Chrysler/Dodge/Jeep/Ram 6.4L/6.2L/6.1L (05-25)

Part #: MB5840SI

Overview

The King Engine Bearings Main Bearing Set is precision-engineered for Chrysler and Dodge Gen III HEMI engines, including the 5.7L, 6.1L, and 6.4L variants found in a wide range of vehicles from 2005 through 2025. Designed to deliver reliable crankshaft support and smooth engine operation, this bearing set is ideal for engine rebuilds, upgrades, and routine maintenance. Whether you are a professional mechanic or an automotive enthusiast, King Engine Bearings provides the durability and precision necessary to maintain optimal engine health under both daily driving and high-performance conditions.

Built to meet the demanding requirements of modern HEMI powerplants, these main bearings ensure consistent performance and longevity, helping to protect your investment and keep your engine running smoothly mile after mile.

Key Features

King Engine Bearings combines advanced materials and manufacturing expertise to produce main bearings that offer dependable performance and extended service life. Key features include:

• Bimetal construction with an aluminum-silicon alloy base for superior wear resistance and conformability
• Precision-machined to OEM specifications for exact fit and optimal oil clearance
• Specifically designed for Chrysler/Dodge Gen III HEMI 5.7L, 6.1L, and 6.4L engines
• Enhanced conformability to accommodate minor crankshaft surface imperfections
• Excellent fatigue strength to withstand high loads and elevated RPMs
• Corrosion-resistant surface treatment for long-lasting durability
• Compatible with both stock and performance engine builds
• Manufactured under strict quality control standards to ensure consistency and reliability

Construction & Design

The King main bearings feature a robust bimetal design that pairs an aluminum-silicon alloy base layer with a steel backing. This combination delivers an optimal balance of strength, flexibility, and wear resistance essential for supporting the crankshaft under dynamic engine loads. The aluminum-silicon layer provides excellent conformability and embedability, allowing the bearing to adapt to minor crankshaft surface irregularities and trap contaminants without damage.

The steel backing ensures structural integrity and dimensional stability, preventing deformation during installation and operation. Precision manufacturing processes maintain tight tolerances and consistent thickness, critical for proper oil clearance and preventing premature bearing failure. This durable construction makes King Engine Bearings a trusted choice for both factory replacements and high-performance applications.

Installation & Fitment

Installation of the King Engine Bearings main bearing set is straightforward for experienced mechanics and engine builders. These bearings are designed as direct replacements for the main bearings in Chrysler and Dodge Gen III HEMI 5.7L, 6.1L, and 6.4L engines, ensuring proper fitment without the need for modifications. To achieve optimal performance and longevity, it is essential to follow manufacturer torque specifications and use appropriate assembly lubricants during installation.

Before installation, always inspect crankshaft journals for wear or damage and measure bearing clearances with precision tools to confirm correct tolerances. Proper installation helps prevent premature bearing wear and maintains smooth engine operation across all driving conditions.

What's Included

• Complete set of main bearings for Chrysler/Dodge Gen III HEMI 5.7L, 6.1L, and 6.4L engines
• Upper and lower bearing shells sized for precise crankshaft fitment
• Packaging and installation instructions for easy identification and guidance

Ideal For

This main bearing set is perfect for automotive enthusiasts, professional engine builders, and mechanics performing engine rebuilds or upgrades on Chrysler and Dodge Gen III HEMI engines. It suits a wide range of applications, from daily-driven vehicles to high-performance builds requiring reliable crankshaft support and enhanced durability. Whether restoring a classic HEMI or assembling a high-output engine, King Engine Bearings delivers the quality and precision needed for dependable operation and long-lasting performance.

King Engine Bearings specializes in engine bearings with a strong footprint in performance and racing, developing advanced bearing materials and designs for high-load engines. Builders and racers rely on King for main and rod bearings engineered to handle higher cylinder pressures and sustained RPM without sacrificing reliability.