Eagle Chevy Small Block 4340 Forged Steel Crankshaft

If you're building a high-performance Chevy Small Block engine, a strong crankshaft is the foundation of your build. This Eagle 4340 forged steel crankshaft is designed for engines like the Chevy 350, offering a 4.000-inch stroke and internal balance. It's built to handle the stresses of demanding applications, providing a solid core for your engine's rotating assembly.

Eagle starts with a non-twist forging of 4340 steel, a material known for its excellent strength and durability. This forging process helps ensure consistent material properties throughout the crankshaft. The fillet radii are increased to .125-inch, which adds significant strength to the main and rod journals, but it means you'll need chamfered or narrowed bearings to fit correctly. The surface of the crankshaft is nitrided for improved wear resistance and then micropolished to a smooth finish, reducing friction and improving oil flow for the bearings.

This crankshaft is intended for internal balance, meaning the counterweights are designed to balance the weight of the pistons, connecting rods, and their associated forces without the need for external balance weights. This can simplify assembly and is often preferred for certain performance builds. When installing, remember to use the appropriate chamfered or narrowed bearings and refer to Eagle's installation instructions for specific details regarding bearing clearance and assembly.