SBC U/L 4340 Forged Crank - 3.480 Stroke

The EAGLE SBC U/L 4340 Forged Crank with 3.480 stroke is a premium foundation component for small-block Chevrolet engine builds demanding reliability and precision. This crankshaft is engineered for enthusiasts and professional builders who require OEM-plus strength without the weight penalty of cast iron. Whether you're assembling a street performance engine, competition platform, or high-RPM application, a quality forged crankshaft is essential for handling elevated cylinder pressures and extended service intervals.

EAGLE's 4340 forged steel construction provides superior fatigue resistance and material integrity compared to standard cast cranks, allowing sustained operation at higher boost levels and combustion pressures. The 3.480-inch stroke dimension combines with compatible piston and rod selections to define your engine's displacement and power band characteristics, making this crankshaft a critical specification tool for displacement calculations and performance tuning. The ultra-light (U/L) designation indicates weight optimization without compromising structural integrity—a performance advantage in applications where reducing rotating mass improves throttle response and engine efficiency.

Precision forging and modern metallurgy ensure consistent journal diameters and critical bearing surfaces that support both naturally aspirated and forced-induction configurations. This crankshaft delivers measurable benefits for rebuild projects targeting 5000+ RPM sustained operation, making it an ideal choice for high-performance applications.