BBC 4340 Crankshaft 4.500 Stroke

The BBC 4340 Crankshaft 4.500 Stroke from SCAT ENTERPRISES is purpose-built for serious big-block Chevy engine builders seeking maximum displacement and durability in high-performance applications. This premium crankshaft serves drag racers, marine engine builders, and street performance enthusiasts who demand reliability under extreme loads and RPM demands. Whether you're building a 454 stroker engine or constructing a competition platform, this 4340 forged steel crank provides the foundation for power and longevity.

Machined from 4340 steel—a superior alloy chosen for its exceptional strength-to-weight ratio and fatigue resistance—this crankshaft handles the violent stresses of high-boost forced induction, nitrous oxide systems, and sustained high-RPM operation. The 4.500-inch stroke dimension creates the larger piston travel necessary for increased displacement, allowing builders to squeeze maximum cubic inches from BBC platform engines while maintaining proper rod-to-stroke ratios. SCAT's precision manufacturing ensures tight tolerances, proper journal sizing, and balanced geometry critical to smooth operation and extended component lifespan in competitive or street-driven powerplants.

This crankshaft is ideal for engine builders combining it with compatible rods, pistons, and block work to achieve 454 cubic inch or larger BBC configurations. Installation requires proper balancing to your specific rotating assembly weight and damper selection—work only with experienced machine shops equipped to verify journal concentricity and crankshaft runout. Weighing 76 pounds, factor this into your total rotating mass calculations for balancing purposes. Perfect for race engines, restomod builds, and marine applications where proven big-block architecture demands premium components.