King Engine Bearings Main Bearing Set

2005–Present Chrysler / Dodge Gen III HEMI 5.7, 6.1, 6.4 Engines

MB5840SI0.25

Overview:

The King Engine Bearings Main Bearing Set is engineered specifically for Chrysler and Dodge Gen III HEMI engines, including the 5.7L, 6.1L, and 6.4L variants. Designed to meet the demanding requirements of high-performance and daily-driven applications, this bearing set ensures reliable crankshaft support and optimal engine longevity. Ideal for engine rebuilds, upgrades, or repairs, these main bearings provide the precision and durability needed to maintain proper oil clearance and reduce friction under extreme operating conditions.

Whether you are a professional mechanic or an enthusiast performing a rebuild, King Engine Bearings delivers a trusted solution that helps protect your investment and maintain engine integrity.

Key Features:

This main bearing set incorporates advanced materials and manufacturing techniques to deliver superior performance and durability:

• Bimetal construction with an aluminum-silicon base for excellent wear resistance and conformability
• Precision-machined to OEM specifications for perfect fit and optimal oil clearance
• Designed to withstand high loads and temperatures typical of Gen III HEMI engines
• Corrosion-resistant surface treatment to extend bearing life
• Compatible with 0.25mm undersize crankshafts for accurate sizing during rebuilds
• Manufactured by King Engine Bearings, a trusted name in high-quality engine components
• Ideal for both street performance and light racing applications

Construction & Design:

The King main bearings feature a bimetal design, combining a robust aluminum-silicon alloy base with a durable overlay to provide excellent fatigue strength and conformability. This construction allows the bearing to adapt to minor crankshaft imperfections while maintaining a stable oil film to prevent metal-to-metal contact. The aluminum-silicon base offers superior wear resistance and heat dissipation, critical for the high-performance environment of Chrysler and Dodge Gen III HEMI engines.

Each bearing shell is precision-engineered to meet or exceed OEM tolerances, ensuring consistent performance and ease of installation. The surface finish and coating are optimized to reduce friction and resist corrosion, contributing to longer engine life and improved reliability.

Installation & Fitment:

This main bearing set is designed for direct fitment on Chrysler and Dodge Gen III HEMI 5.7L, 6.1L, and 6.4L engines, including those requiring 0.25mm undersize bearings. Installation should be performed by a qualified technician or experienced enthusiast using proper tools and procedures to ensure correct bearing clearance and alignment. No modifications to the engine block or crankshaft are necessary when using these bearings within their specified size range.

Proper lubrication and torque specifications must be followed during installation to maximize bearing life and engine performance.

What's Included:

• Main bearing shells sized for 0.25mm undersize crankshafts
• Complete set to support all main journals of Gen III HEMI 5.7, 6.1, and 6.4 engines
• Packaging and documentation from King Engine Bearings

Ideal For:

This main bearing set is ideal for engine rebuilders, performance enthusiasts, and professional mechanics working on Chrysler and Dodge Gen III HEMI engines. It suits applications ranging from daily drivers to moderate performance builds where reliability and precision are paramount. Whether restoring a classic muscle car or upgrading a modern HEMI-powered vehicle, these bearings provide a dependable foundation for engine longevity and smooth operation.

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.