Eagle Chrysler BB 3.750in Stroke Forged 4340 Steel Crankshaft

If you're building a high-performance Chrysler big block engine and need a solid foundation, this Eagle forged 4340 steel crankshaft is a serious contender. It's designed with a 3.750-inch stroke, giving you the displacement potential for significant power gains. This isn't just a replacement part; it's a core component for engines that will be pushed hard.

Eagle starts with a non-twist forging of 4340 steel, which is known for its strength and durability, making it a popular choice for performance builds. To further enhance its robustness, this crankshaft features a nitrided surface treatment and a micropolished finish. The nitriding process hardens the surface, increasing wear resistance, while the micropolishing ensures smooth operation and helps maintain oil film on the bearing surfaces. Eagle also specifies .125-inch fillet radii, which are designed for superior strength, but this means you'll need to use chamfered or narrowed bearings to ensure proper clearance.

This crankshaft is intended for demanding applications where reliability under stress is paramount. When you're assembling an engine that needs to perform consistently at high RPMs and under heavy load, starting with a well-built crankshaft like this one sets you up for success. Make sure to consult your engine builder or the manufacturer's instructions regarding bearing selection and installation to get the most out of this component.