Manley Performance 4340 Forged Crankshaft

Chrysler 5.7L / 6.1L HEMI 4.080in Stroke

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Overview:

The Manley Performance 4340 Forged Crankshaft is engineered specifically for Chrysler 5.7L and 6.1L HEMI engines, offering a robust upgrade for enthusiasts seeking enhanced durability and performance. Crafted from premium 4340 alloy steel, this crankshaft is designed to withstand the rigors of high-performance applications while maintaining precise balance and reliability.

Ideal for street performance, track use, and engine builds requiring a longer stroke, this crankshaft helps you achieve improved torque characteristics and engine responsiveness. Whether you are upgrading your factory rotating assembly or building a custom powerplant, this forged crankshaft delivers the strength and quality needed for demanding conditions.

Key Features:

Manley’s Pro Series 4340 forged crankshaft combines advanced materials and precision manufacturing to provide a high-performance foundation for your engine build. Key features include:

• Constructed from premium 4340 alloy steel for superior strength and fatigue resistance.
• Forged manufacturing process ensures enhanced durability compared to cast or billet alternatives.
• 4.080-inch stroke designed to increase displacement and torque output in Chrysler 5.7L and 6.1L HEMI engines.
• Includes a 32-tooth reluctor wheel compatible with factory ignition and timing systems.
• Precision ground journals and balanced for smooth operation and reduced vibration.
• Compatible with a wide range of domestic engine applications requiring a forged rotating assembly.
• Ideal for performance enthusiasts seeking reliable upgrades for street, strip, or track use.

Construction & Design:

This crankshaft is forged from 4340 alloy steel, a material known for its excellent toughness and resistance to wear and fatigue. The forging process aligns the grain structure of the steel, resulting in a component that can handle increased loads and higher RPMs without failure.

The 4.080-inch stroke length is carefully engineered to optimize piston travel and improve torque delivery, making it a popular choice for performance builds on Chrysler HEMI engines. The integrated 32-tooth reluctor wheel ensures seamless integration with factory electronic ignition and engine management systems, maintaining precise timing signals.

Installation & Fitment:

This crankshaft is designed as a direct replacement for Chrysler 5.7L and 6.1L HEMI engines requiring a 4.080-inch stroke. It fits into the factory block and uses standard mounting points, making installation straightforward for experienced engine builders.

No modifications to the engine block or external components are typically required, but professional installation and proper balancing are recommended to ensure optimal performance and longevity.

What's Included:

• Manley Pro Series 4340 forged crankshaft with 4.080-inch stroke
• 32-tooth reluctor wheel installed

Ideal For:

• Performance enthusiasts upgrading Chrysler 5.7L or 6.1L HEMI engines
• Engine builders seeking a durable forged crankshaft for street or track use
• Applications requiring increased stroke for improved torque and displacement
• Rebuilds and custom engine projects demanding high-strength rotating assemblies

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.