Manley Performance Ductile Iron Top Ring Set

2005–2008 Chrysler 300C, 2005–2007 Dodge Magnum, 2006–2008 Dodge Charger, 2006–2008 Jeep Grand Cherokee 5.7L / 6.1L HEMI & SRT8

Part #: 46121-8

Overview

The Manley Ductile Iron Top Ring Set is engineered for enthusiasts and professional builders seeking durable, high-performance piston rings designed to withstand the rigors of powerful HEMI and SRT8 engines. Specifically crafted for Chrysler 300C, Dodge Magnum, Dodge Charger, and Jeep Grand Cherokee models equipped with 5.7L and 6.1L engines, this top ring set ensures a reliable seal under high combustion pressures and temperatures.

Manley Performance’s commitment to quality and precision makes this ring set an excellent choice for those upgrading or rebuilding their engines, delivering improved durability and consistent performance over stock components.

Key Features

Designed to meet the demands of high-output engines, the Manley Ductile Iron Top Ring Set offers the following key features:

• Constructed from high-strength ductile iron for enhanced wear resistance and longevity
• Plasma-Moly inlay on the ring face for superior sealing and reduced friction
• Precisely machined to a 3.922-inch bore size, ensuring exact fitment and optimal compression
• Compatible with both 5.7L HEMI and 6.1L SRT8 engines found in multiple Chrysler, Dodge, and Jeep models
• Engineered to maintain excellent ring seal under high combustion pressures and temperatures
• Resists scuffing and galling, extending engine life and reducing maintenance intervals
• Ideal for performance rebuilds, street performance, and mild racing applications

Construction & Design

The top rings are manufactured from premium ductile iron, a material known for its toughness and flexibility compared to traditional cast iron. This construction allows the rings to better absorb the stresses of high-performance operation without cracking or breaking.

The ring face features a plasma-molybdenum (Plasma-Moly) inlay, which provides a hard, wear-resistant surface that reduces friction against the cylinder wall. This advanced coating enhances ring sealing efficiency and contributes to improved oil control and combustion chamber pressure retention.

Each ring is precision ground and finished to exacting tolerances, ensuring consistent bore fitment and reliable performance across the specified engine applications.

Installation & Fitment

This top ring set is designed as a direct fit replacement for 2005–2008 Chrysler 300C 5.7L HEMI and 6.1L SRT8 engines, 2005–2007 Dodge Magnum 5.7L and 6.1L SRT8 engines, 2006–2008 Dodge Charger 5.7L HEMI and 6.1L SRT8 engines, and 2006–2008 Jeep Grand Cherokee 6.1L SRT8 engines. Proper ring gap measurement and adjustment are recommended during installation to ensure optimal sealing and engine performance.

Installation should be performed by a qualified technician or experienced engine builder to guarantee correct ring orientation and seating. No modifications to the cylinder bore are typically required when using this ring set within the specified bore size.

What's Included

• Complete set of ductile iron top piston rings with Plasma-Moly inlay
• Packaging and installation instructions

Ideal For

This Manley Ductile Iron Top Ring Set is ideal for automotive enthusiasts, engine builders, and performance tuners who are rebuilding or upgrading Chrysler, Dodge, and Jeep HEMI and SRT8 engines. It suits applications ranging from street performance to mild racing, where durability and reliable sealing are critical for maintaining engine power and longevity.

Manley Performance manufactures high-strength engine internals for serious builds—especially forged pistons, connecting rods, valves, and valvetrain components developed for racing and high-output street applications. If you’re building for boost, high compression, or sustained RPM, Manley is a common choice for parts engineered to take abuse and keep power reliable.