Manley Performance Extreme Duty Pistons

2011–2024 Chrysler 300, Dodge Challenger, Dodge Charger, Dodge Durango, Jeep Grand Cherokee, Jeep Wrangler, Ram 2500, Ram 3500, Jeep Grand Wagoneer 6.4L 392 HEMI

Part #: 598900CE-8

Overview

The Manley Extreme Duty Piston Set is engineered specifically for Chrysler’s 6.4L 392 HEMI engines, delivering a robust foundation for high-performance builds. These forged pistons are designed to withstand the rigors of street, track, and professional racing applications, offering exceptional strength and durability. Featuring a -12.5cc dish design and a 4.090-inch bore, they optimize combustion chamber volume to support precise compression ratios and improved engine efficiency.

Ideal for enthusiasts and engine builders aiming to increase power output while maintaining reliability, this piston set ensures consistent performance under demanding conditions. Whether upgrading a factory engine or assembling a race-ready powerplant, these pistons provide the durability and precision fitment required for long-term success.

Key Features

Manley’s Extreme Duty Pistons incorporate advanced materials and design innovations to meet the highest standards of performance and durability:

• Forged from premium 2618 aluminum alloy for superior strength and fatigue resistance under extreme combustion pressures.
• Precision-machined with a 4.090-inch bore and 1.210-inch compression height for exact fitment in Chrysler 6.4L HEMI engines.
• -12.5cc dish piston design optimizes combustion chamber volume and supports targeted compression ratios.
• Advanced cam and barrel skirt profiles reduce friction and wear, enhancing piston longevity.
• Moly skirt coatings minimize friction and improve piston ring sealing for smoother operation.
• Coated piston surfaces increase heat resistance and reduce scuffing in high-temperature environments.
• Durable tool steel wrist pins provide a strong, reliable connection between piston and connecting rod at high RPMs.
• Set of eight pistons designed for complete V8 engine rebuilds.

Construction & Design

Manufactured using 2618 aluminum alloy forgings, these pistons feature a dense, uniform grain structure that excels in high-performance and racing environments. The forging process enhances strength and thermal stability, enabling the pistons to endure elevated combustion pressures and temperatures without compromising integrity.

Carefully engineered cam and barrel skirt profiles reduce piston-to-cylinder wall friction, while the moly skirt coating further lowers friction and helps maintain a tight piston ring seal. This combination reduces wear and piston slap noise, contributing to improved engine efficiency and longevity.

Tool steel wrist pins ensure a robust connection to the connecting rods, resisting bending or deformation during high-RPM operation. The coated piston surfaces improve heat dissipation and protect against scuffing, supporting consistent performance over extended use.

Installation & Fitment

This piston set is a direct fit for Chrysler 6.4L HEMI engines with a 4.090-inch bore and 1.210-inch compression height. The -12.5cc dish volume is engineered to complement specific combustion chamber designs and compression ratios, requiring no special modifications beyond standard engine assembly procedures.

Proper block bore machining to the specified size and careful ring and pin installation per engine specifications are essential for optimal performance and reliability. The set includes eight pistons, perfect for a complete V8 rebuild on compatible vehicles.

What's Included

• Set of 8 forged 2618 aluminum alloy pistons with -12.5cc dish
• Tool steel wrist pins
• Coated piston skirts for reduced friction and improved ring seal

Ideal For

• Performance enthusiasts building high-output Chrysler 6.4L HEMI engines
• Professional engine builders seeking durable, race-proven pistons
• Street and track applications requiring reliable forged pistons
• Engine rebuilds aiming to improve strength and longevity under increased boost or power