Eagle Chevy Big Block 3.766in Stoke - Internal Balance - CCW - Forged 4140 Steel Crankshaft

If you're building a high-performance Chevy Big Block engine for serious power and high RPM use, a strong crankshaft is the heart of the operation. This Eagle forged 4340 steel crankshaft is built to handle the demands of boosted or naturally aspirated performance builds, offering a 3.766-inch stroke for increased displacement and power potential. It's designed for internal balance, simplifying setup in many performance applications.

Eagle starts with a non-twist forging of 4340 steel, a material known for its strength and durability under extreme stress. The center counterweights are a key feature here, providing added stability as engine speeds climb, which is crucial for preventing harmonics and ensuring longevity in high-power engines. To further enhance its robustness, the crankshaft features 125-inch fillet radii, which means you'll need chamfered or narrowed bearings to accommodate them, and the entire unit is nitrided and micropolished. This surface treatment and finish work together to improve wear resistance and reduce friction, making it a solid choice for demanding builds.

This crankshaft is specifically intended for Chevrolet 396 and 427 Big Block applications. Because it's designed for high-performance use, it's important to ensure all supporting components, including bearings and connecting rods, are compatible with its specifications, particularly the 125-inch fillet radii and the need for chamfered or narrowed bearings.