BBC 4340 Forged Magnum Crank - 4.375 Stroke

The BBC 4340 Forged Magnum Crank - 4.375 Stroke is designed for big-block Chevrolet engine builders who demand maximum durability and performance in extreme motorsport applications. This crankshaft is ideal for serious enthusiasts running high-horsepower builds, including those with forced induction systems and sustained high-RPM operation.

Constructed from 4340 forged steel, this crankshaft offers superior fatigue resistance and tensile strength, making it suitable for handling the detonation loads and harmonics found in nitrous, supercharged, or turbocharged applications. The 4.375-inch stroke geometry allows for significant displacement increases while maintaining compatibility with proven big-block packaging.

Builders targeting 500+ horsepower platforms will find this crankshaft essential for competition, street/strip dual-purpose vehicles, and heavily modified street engines. The Magnum design features optimized counter-weight geometry and enhanced fillet radii to distribute stress evenly, preventing catastrophic failure during peak combustion events.