Eagle Chevrolet Big Block 4.250in Stoke Internal Balance Forged 4140 Steel Crankshaft

This is an Eagle forged 4140 steel crankshaft specifically for Chevrolet Big Block engines, featuring a 4.250-inch stroke and designed for internal balance. It's built with a non-twist forging process and .125-inch fillet radii, which are chamfered or narrowed to accept specific bearings, enhancing overall strength for demanding applications. The crankshaft also receives a nitrided surface treatment and is micropolished for improved durability and performance.

Intended for competition use, this crankshaft is a solid choice if you're building a high-performance engine where reliability under stress is critical. The forged 4140 steel construction offers a strong foundation, while the nitriding process hardens the surface to resist wear and fatigue. The .125-inch fillet radii are a notable detail, requiring specific bearing types but contributing to the crank's ability to handle significant loads without flexing.

When installing this crankshaft, remember that the chamfered or narrowed fillet radii mean you'll need to use compatible bearings. This part is designed for competition, so ensure your entire engine build is suited for that kind of stress. Always refer to the manufacturer's installation instructions for specific details regarding bearing selection and assembly procedures.