BBC 4340 Forged Crank - 4.500 Stroke

The BBC 4340 Forged Crank - 4.500 Stroke by EAGLE is the foundation of any serious big-block Chevrolet engine build, whether you're assembling a street performer, weekend warrior, or competition platform. This forged crankshaft represents the core rotating assembly component that converts piston motion into usable horsepower and torque. Builders and mechanics specify EAGLE cranks when durability, dimensional accuracy, and reliability under load matter most.

Manufactured from premium 4340 alloy steel, this crankshaft is engineered to handle sustained high RPM and elevated cylinder pressures that stock cast-iron units cannot tolerate. The 4.500-inch stroke designation defines the piston travel distance, directly influencing engine displacement and torque characteristics—a longer stroke typically favors mid-range power delivery and load-carrying capability over peak RPM performance. The forged construction process strengthens the material grain structure, reducing flex and micro-fracturing risk compared to cast alternatives. At 82.15 pounds, this crank is precision-weighted for proper balance and vibration control when paired with compatible pistons, rods, and dampers.

This component suits engine rebuilds, stroker kits, and displacement increases across BBC applications—from truck and marine duty to drag racing and street performance. Installation requires proper balancing to your specific piston and rod combination, professional engine assembly knowledge, and compatible timing cover and harmonic balancer. Verify journal sizes, main cap style, and oiling specifications before ordering to ensure correct fitment in your particular block and intended power level.