SBC CS 4340 Forged Crank 4.000 Stroke 400 Mains

The SBC CS 4340 Forged Crank 4.000 Stroke 400 Mains from Callies represents the gold standard for serious small-block Chevy engine builds. Designed for high-performance street and racing applications, this crankshaft delivers the reliability and strength required when boosting displacement and horsepower in small-block platforms. Whether you're planning a stroker motor for increased torque, forced-induction tuning, or naturally aspirated power builds, this forged unit provides the structural integrity needed for sustained high-RPM operation and heavy load cycles.

Constructed from premium 4340 forged alloy steel, the SBC CS crankshaft offers superior fatigue resistance and impact strength compared to cast alternatives, critical when engine internals experience increased cylinder pressures from turbocharging, supercharging, or nitrous oxide systems. The 4.000-inch stroke combined with 400-main journals creates a proven displacement platform—when paired with appropriate bore sizing and connecting rods, builders can achieve 406–427 cubic-inch displacements with excellent rod-ratio geometry. The precision-forged design minimizes weight concentration while maintaining critical journals and thrust surfaces, essential for minimizing bearing wear and extending engine longevity under competition or high-output street duty.

This crankshaft is ideal for engine builders constructing durable stroker assemblies, turbo small-blocks, or high-RPM naturally aspirated motors targeting consistent 6000+ RPM operation. Installation requires matching 400-main compatible blocks, bearings, and dampers; verify block compatibility before purchase, as stroker cranks demand proper alignment and clearance verification. Callies cranks are widely trusted by professional engine builders and serious enthusiasts who prioritize reliability over budget alternatives, making this unit suitable for customers investing in quality long-block internals.