Melling Hi-Perf Valve Spring Kit

2005–2008 Chrysler 300, Dodge Charger, Dodge Durango, Dodge Magnum, Dodge Ram 1500/2500/3500, Jeep Commander, Jeep Grand Cherokee 5.7L Hemi

Part #: 46654-16

Overview

The Melling Hi-Perf Valve Spring Kit is a precision-engineered upgrade designed specifically for Chrysler, Dodge, Jeep, and Ram vehicles equipped with the 5.7L Hemi engine from 2005 to 2008. This kit delivers enhanced valve train stability and durability, making it an excellent choice for enthusiasts seeking improved throttle response, higher RPM capability, and reliable performance under demanding driving conditions.

Whether you are building a street-driven machine or preparing your engine for competitive racing environments, Melling’s valve springs provide consistent valve control and reduced valve float compared to stock components. This kit is ideal for professional builders and experienced enthusiasts aiming to maximize the potential of their 5.7L Hemi engines without compromising OEM fitment or reliability.

Key Features

Engineered with advanced materials and innovative design, the Melling valve spring kit offers superior performance and long-lasting durability. Key features include:

• Beehive spring design reduces mass for improved valve train stability and quicker valve response
• 1.230 inch open height with 348 PSI open pressure for enhanced high RPM capability
• 1.800 inch installed height with 130 PSI installed pressure ensuring optimal valve seating
• Set of 16 single springs engineered for consistent performance across all valves
• Performance valve locks, seals, and retainers included to maintain valve train integrity
• Coil bind height of 1.141 inches to prevent over-compression and spring failure
• Precision inside diameter ranging from 0.645 in to 0.825 in for exact fitment
• Outside diameter between 1.019 in and 1.199 in compatible with OEM valve train components
• Grade type optimized for street and race applications

Construction & Design

Melling valve springs are manufactured using high-grade materials and advanced spring technology to endure the stresses of high-performance use. The innovative beehive design reduces spring mass, lowering valve train inertia and enabling faster valve response. This design also improves coil harmonics, significantly reducing the risk of valve float at elevated engine speeds.

Each spring is precision wound to exact specifications, ensuring consistent installed and open heights for reliable valve control and extended service life. The included valve locks, seals, and retainers are engineered to complement the springs perfectly, providing a complete valve train upgrade that maintains OEM fitment and function.

Installation & Fitment

This valve spring kit is a direct fit replacement for a wide range of Chrysler, Dodge, Jeep, and Ram 5.7L Hemi models from 2005 to 2008, including the Chrysler 300, Dodge Charger, Dodge Durango, Dodge Magnum, Dodge Ram 1500/2500/3500, Jeep Commander, and Jeep Grand Cherokee. Installation requires standard valve spring compressor tools and a solid understanding of valve train components.

No modifications to the cylinder head or valve train are typically necessary, making this kit suitable for professional mechanics and experienced enthusiasts alike. The kit ensures a straightforward installation process while delivering a significant upgrade in valve train performance and durability.

What's Included

• Set of 16 high-performance beehive valve springs (Melling part #466544)
• Performance valve locks
• Durable valve seals designed for leak prevention
• Retainers engineered for enhanced spring retention and longevity
• Complete spring kit packaging for easy identification and installation

Ideal For

This valve spring kit is perfect for performance enthusiasts, street drivers, and racers who demand reliable valve control and enhanced engine durability. It is well-suited for those upgrading their 5.7L Hemi engines for higher RPM operation, improved throttle response, or increased valve train stability under aggressive driving conditions. Whether restoring a classic Dodge Ram or building a race-ready Jeep Grand Cherokee, Melling’s valve springs provide a dependable foundation for your engine’s valvetrain performance.

Melling is an engine-parts manufacturer best known in performance circles for oil pumps, camshafts, and valvetrain/timing components. Their performance line focuses on parts that support stable oiling and durability—key foundations for high-RPM and high-load builds where lubrication and valvetrain control are critical.