SBC 4340 Forged Crank - 3.875 Stroke

The EAGLE SBC 4340 Forged Crank with 3.875 stroke is a premium forged crankshaft specifically designed for small-block Chevrolet engines. It is engineered to provide robust durability and reliable performance, making it suitable for high-performance applications such as bracket racing and endurance builds where stock cast-iron cranks may fail under high horsepower and cylinder pressures.

Constructed from 4340 alloy steel, this crankshaft offers superior fatigue resistance compared to OEM specifications. The forging process enhances the molecular grain structure, eliminating weak points found in cast designs. The 3.875-inch stroke is crucial for defining engine displacement and RPM characteristics, providing a balanced revving capability and effective torque delivery.

This crankshaft is compatible with small-block Chevrolet engine blocks ranging from 265 to 400 cubic inches, utilizing standard rod and main bearing packages. Proper installation requires professional engine machine work, including balancing, to ensure optimal performance and longevity under demanding conditions.