Manley Performance 4340 Forged Crankshaft

Chrysler 5.7L / 6.1L HEMI Engines

191958

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 high-quality 4340 alloy steel, this crankshaft is designed to withstand the rigors of high-performance applications while maintaining precise balance and reliability.

Ideal for performance builders, street drivers, and racers alike, this crankshaft supports increased stroke length at 4.050 inches, providing improved torque potential and engine responsiveness. Whether you are upgrading your engine for spirited driving or track use, this forged crankshaft delivers the strength and precision needed to handle elevated power levels.

Key Features:

Manley’s Pro Series 4340 Forged Crankshaft combines premium materials and expert manufacturing to enhance engine performance and longevity. Key features include:

• Constructed from high-strength 4340 alloy steel for superior toughness and fatigue resistance.
• Forged design ensures optimal grain flow and structural integrity under high stress.
• 4.050-inch stroke length tailored for Chrysler 5.7L and 6.1L HEMI engines to increase displacement and torque output.
• Includes a 58-tooth reluctor wheel compatible with factory ignition and timing systems.
• Precision machined journals and bearing surfaces for excellent fitment and smooth operation.
• Balanced to reduce vibration and improve engine smoothness at high RPMs.
• Designed to support high-performance builds including forced induction and naturally aspirated setups.
• Compatible with a wide range of domestic engine applications, making it versatile for various Chrysler HEMI projects.

Construction & Design:

This crankshaft is meticulously forged from 4340 alloy steel, a material known for its exceptional strength and durability in demanding engine environments. The forging process enhances the metal’s grain structure, resulting in a component that resists cracking and deformation under extreme loads.

Manley’s precision machining ensures tight tolerances on all bearing journals and surfaces, promoting optimal oil clearance and bearing life. The integrated 58-tooth reluctor wheel is designed to maintain factory electronic timing signals without modification, preserving engine management system compatibility.

The 4.050-inch stroke increases piston travel, which can translate into greater torque and improved engine character, especially when combined with complementary internal upgrades.

Installation & Fitment:

This crankshaft is designed as a direct replacement for Chrysler 5.7L and 6.1L HEMI engines, fitting OEM bearing caps and requiring no modifications to factory components. Installation follows standard engine assembly procedures, and the included reluctor wheel ensures seamless integration with existing ignition and timing systems.

No cutting, drilling, or special tuning is required to install this crankshaft, making it a straightforward upgrade for experienced engine builders and professional shops.

• Direct fit for Chrysler 5.7L and 6.1L HEMI engines
• Uses factory bearing caps and hardware
• Includes 58-tooth reluctor wheel for OEM timing compatibility
• No modifications or special tuning necessary

What's Included:

• Manley Pro Series 4340 Forged Crankshaft with 4.050-inch stroke
• Integrated 58-tooth reluctor wheel

Ideal For:

• Performance enthusiasts upgrading Chrysler 5.7L or 6.1L HEMI engines
• Engine builders seeking durable forged internals for street or track use
• Applications requiring increased stroke length for improved torque
• High-performance naturally aspirated or forced induction builds
• Rebuilds aiming to enhance engine strength and reliability

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.