Eagle Forged Crankshaft

Modern Chrysler HEMI Engines

439340506125

Overview:

The Eagle Forged Crankshaft is engineered for high-performance Chrysler Modern HEMI engines, delivering exceptional strength and durability for demanding applications. Crafted from premium 4340 forged steel, this crankshaft is designed to withstand the rigors of racing, high-horsepower builds, and heavy-duty street use. Its robust construction ensures reliable operation under extreme conditions, making it an ideal choice for enthusiasts and professional builders seeking a dependable rotating assembly component.

Featuring a 4.050" stroke and 2.000" rod journals, this crankshaft is tailored for modern HEMI platforms, providing the foundation for increased displacement and power potential. The included 58-tooth reluctor wheel supports accurate ignition timing and compatibility with factory or aftermarket engine management systems.

Key Features:

This Eagle crankshaft incorporates advanced forging and finishing techniques to maximize strength and longevity:

• Constructed from high-grade 4340 forged steel for superior toughness
• Non-twist forging process enhances structural integrity and fatigue resistance
• .125" fillet radii reduce stress concentrations for improved durability
• Requires chamfered or narrowed bearings due to fillet radius design
• Nitrided surface treatment increases wear resistance and fatigue life
• Micropolished journals for optimal bearing surface finish and reduced friction
• Includes a 58-tooth reluctor wheel for precise ignition timing
• Designed specifically for Chrysler Modern HEMI engines with a 4.050" stroke
• 2.000" rod journal diameter compatible with common HEMI connecting rods

Construction & Design:

The crankshaft is forged from 4340 steel, a chromium-molybdenum alloy known for its excellent strength-to-weight ratio and toughness. The non-twist forging method ensures that the crankshaft maintains its shape and resists deformation under high loads, which is critical in high-performance and racing environments. The generous .125" fillet radii at the journal transitions reduce stress risers, significantly enhancing fatigue resistance compared to standard crankshafts.

To further extend service life, the crankshaft undergoes a nitriding process that hardens the surface, improving wear resistance without compromising core toughness. The micropolished finish on the journals reduces friction and helps maintain oil film integrity, contributing to smoother engine operation and longer bearing life.

Installation & Fitment:

This crankshaft is designed for Chrysler Modern HEMI engines and requires balancing to match your specific rods and pistons for optimal performance and durability. Due to the larger fillet radii, chamfered or narrowed bearings are necessary to ensure proper clearance and prevent interference. Professional installation and precise balancing are recommended to achieve the best results and maintain engine reliability.

What's Included:

• One Eagle forged 4340 steel crankshaft with 4.050" stroke
• 58-tooth reluctor wheel installed

Ideal For:

This crankshaft is ideal for engine builders, racers, and performance enthusiasts upgrading or rebuilding Chrysler Modern HEMI engines who demand a strong, reliable rotating assembly component capable of handling increased power and stress. It is well suited for high-performance street cars, drag racing, road racing, and other motorsport applications where durability and precision are paramount.

Eagle Specialty Products manufactures high-strength engine components—most notably connecting rods and crankshafts—intended for performance and racing engines. These rotating-assembly upgrades are commonly used in builds that demand higher strength margins for boost, nitrous, sustained RPM, or competition use.

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