Manley Performance Extreme Duty Piston Set

Chrysler 6.4L HEMI 4.090in Bore / 3.724in Stroke 11:1 Compression Ratio

598800CE-8

Overview:

The Manley Performance Extreme Duty Piston Set is engineered specifically for Chrysler 6.4L HEMI engines, delivering reliable strength and precision for high-performance builds. Designed with professional engine builders and serious enthusiasts in mind, these pistons provide the durability and performance needed to handle demanding conditions and increased power levels.

Featuring a 1.75cc dome design and an 11:1 compression ratio, this piston set is ideal for those looking to optimize combustion efficiency and power output without sacrificing reliability. Whether you are building a street performance engine or a track-focused powerplant, these pistons offer a proven foundation for extreme duty applications.

Key Features:

Manley’s Platinum Series pistons incorporate advanced materials and design elements to ensure superior performance and longevity:

• Forged from premium 2618 aluminum alloy for exceptional strength and fatigue resistance under high stress.
• Proven cam and barrel skirt profiles reduce friction and wear, improving piston stability and durability.
• Tool steel wrist pins provide enhanced strength and reliability in the piston-pin connection.
• Moly skirt coatings on select part numbers reduce friction and improve wear characteristics.
• 1.75cc dome design optimizes combustion chamber shape for improved power and efficiency.
• Precision machined to exacting tolerances for consistent bore fit and performance.
• Compatible with 4.090-inch bore and 3.724-inch stroke configurations, matching the Chrysler 6.4L HEMI specifications.
• Designed for extreme duty use, supporting high horsepower and torque applications.

Construction & Design:

These pistons are crafted from 2618 alloy, a high-strength aluminum alloy known for its excellent thermal and mechanical properties in high-performance engines. The forging process ensures a dense, uniform grain structure that withstands the rigors of extreme combustion pressures and temperatures.

The cam and barrel skirt profiles have been carefully developed to minimize piston slap and reduce friction, contributing to smoother engine operation and longer component life. The inclusion of tool steel wrist pins further enhances the assembly’s durability, ensuring reliable piston-to-connecting rod articulation under heavy loads.

Additionally, the moly skirt coating applied to select pistons reduces metal-to-metal contact, lowering wear and improving break-in characteristics. The 1.75cc dome shape is optimized to work with the 11:1 compression ratio, balancing power gains with engine reliability.

Installation & Fitment:

This piston set is designed as a direct replacement for Chrysler 6.4L HEMI engines with a 4.090-inch bore and 3.724-inch stroke. It fits applications requiring an 11:1 compression ratio and a 1.75cc dome piston design. Installation requires standard engine assembly procedures and proper clearances to ensure optimal performance and longevity.

No modifications to the engine block or connecting rods are typically necessary when installing this piston set, but professional installation and precise machining are recommended to achieve the best results.

What's Included:

• Complete set of forged 2618 alloy pistons with 1.75cc dome design
• Tool steel wrist pins
• Installation instructions and technical specifications

Ideal For:

• Performance enthusiasts building high-output Chrysler 6.4L HEMI engines
• Professional engine builders requiring durable, race-capable pistons
• Street and track applications demanding extreme duty components
• Rebuilds and upgrades aiming to increase compression and power

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.