SBC 4340 Forged Crank - 3.5625 Stroke

The EAGLE SBC 4340 Forged Crank with 3.5625 inch stroke is a premium small block Chevy crankshaft engineered for high-performance engine builds and race applications. Built from 4340 forged steel, this internally balanced crankshaft delivers the strength and durability demanded in competition environments where engine reliability cannot be compromised. The 3.5625 stroke specification defines the piston travel distance and is critical for displacement calculations, compression ratio optimization, and matching to compatible rod and piston combinations.

Forged 4340 steel provides superior tensile strength and fatigue resistance compared to cast alternatives, making it the standard choice for forced induction, nitrous oxide systems, and sustained high-RPM operation. The internal balance design eliminates the need for external counterweights, reducing overall weight while maintaining proper crankshaft dynamics. The 2-piece seal configuration accommodates both traditional and modern small block Chevy applications, offering flexibility in engine bay compatibility. At 59.53 pounds, this crankshaft is a substantial component requiring proper installation with torque specifications and alignment verification during assembly.

This crankshaft is suited for engine builders, performance shops, and enthusiasts constructing or rebuilding small block Chevy engines for street performance, bracket racing, or circuit competition. The 3.5625 stroke pairs with various bore sizes to create different displacement combinations—critical knowledge for carburetor tuning, fuel injection mapping, and ensuring proper ring gap and piston clearance. Proper installation requires specialized equipment including an engine stand, crankshaft alignment tools, and knowledge of small block Chevy bearing clearances and seal compatibility to achieve reliable, long-term performance.