BBC 4340 Forged Crank - 3.766 Stroke 396ci

The BBC 4340 Forged Crank from EAGLE represents a precision-engineered foundation for serious big block Chevy engine builds. This 3.766 stroke crankshaft is designed for enthusiasts and professional builders who demand reliability in high-performance applications, from street engines to competition platforms. The 396ci displacement potential makes this crank ideal for restorers seeking OEM-style performance or builders targeting increased cubic inches without requiring block modifications.

Constructed from forged 4340 steel, the BBC 4340 Forged Crank delivers superior strength and fatigue resistance compared to cast alternatives, critical for handling peak combustion pressures and maintaining dimensional stability under extreme load cycling. The internal balance design eliminates the need for external counterweights, streamlining installation and reducing complexity in engine assembly. The 2-piece seal configuration provides excellent oil containment while offering straightforward serviceability, and the forged construction ensures consistent grain structure throughout, minimizing stress concentration points that can lead to failure in cast designs.

This crankshaft is best suited for big block Chevrolet engines (BBC) where stroke length directly influences displacement and low-end torque characteristics—the 3.766 inch stroke strikes a balance between street drivability and moderate RPM capability. Builders restoring 396 cubic inch engines or creating custom big block combinations will appreciate the forged durability and internal balance feature, which simplifies rotating assembly weight matching and reduces parasitic losses. Proper installation requires standard crankshaft alignment procedures and compatible connecting rods and pistons; consult your engine builder or service manual for torque specifications and bearing clearance requirements.