Manley Performance Pro Series 4340 Alloy Steel Crankshaft

Chrysler HEMI 5.7L / 6.4L Engines with 4.080in Stroke

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Overview:

The Manley Performance Pro Series crankshaft is a high-quality forged component designed specifically for Chrysler HEMI 5.7L and 6.4L engines. Crafted from premium 4340 alloy steel, this crankshaft offers enhanced strength and durability to support increased power and torque demands.

Ideal for performance enthusiasts, engine builders, and racers seeking a reliable rotating assembly upgrade, this crankshaft helps your engine withstand the rigors of high-performance applications while maintaining smooth operation and longevity.

With a 4.080-inch stroke, it is engineered to optimize displacement and torque output, making it a solid choice for those upgrading or rebuilding their HEMI engines for street, strip, or track use.

Key Features:

This Pro Series crankshaft incorporates several advanced features to ensure superior performance and reliability:

• Constructed from forged 4340 alloy steel for exceptional strength and fatigue resistance.
• Precision-machined to exacting tolerances for optimal balance and smooth engine operation.
• Designed with a 4.080-inch stroke to increase engine displacement and torque potential.
• Compatible with a wide range of Chrysler HEMI 5.7L and 6.4L engine builds.
• Heat-treated and stress-relieved to enhance durability under high-load conditions.
• Features standard journal sizes to fit OEM or aftermarket bearings without modification.
• Ideal for performance upgrades, engine rebuilds, and high-horsepower applications.

Construction & Design:

The Manley Pro Series crankshaft is forged from premium 4340 alloy steel, a material known for its excellent tensile strength and toughness. The forging process ensures a dense, uniform grain structure that resists cracking and fatigue, critical for high-performance engines.

Each crankshaft undergoes precision machining and balancing to meet strict quality standards, providing smooth rotation and reducing vibration. The 4.080-inch stroke design increases piston travel, which can improve torque output and overall engine performance when combined with compatible components.

Stress-relieving and heat treatment processes further enhance the crankshaft’s durability, making it suitable for demanding street and racing environments.

Installation & Fitment:

This crankshaft is designed as a direct fit replacement for Chrysler HEMI 5.7L and 6.4L engines requiring a 4.080-inch stroke component. It uses standard journal dimensions compatible with OEM or aftermarket bearings, facilitating straightforward installation during engine rebuilds or upgrades.

No special modifications, cutting, or welding are required to install this crankshaft when used with compatible engine components. Proper balancing and assembly by a qualified engine builder are recommended to ensure optimal performance and reliability.

What's Included:

• One forged 4340 alloy steel crankshaft with 4.080-inch stroke

Ideal For:

• Performance enthusiasts upgrading Chrysler HEMI 5.7L or 6.4L engines
• Engine builders assembling high-horsepower or high-torque powerplants
• Street, strip, and track applications requiring durable rotating assemblies
• Rebuilds seeking a reliable forged crankshaft upgrade

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.