LS7 Apex 4340 Forged Crank 4.000 Stroke

The Callies LS7 Apex 4340 Forged Crank with 4.000 stroke is a premium crankshaft engineered for high-performance LS-series engine builds. Forged from 4340 steel, this internally balanced component delivers the structural integrity and precision required for forced-induction applications, turbocharged platforms, and naturally aspirated builds targeting sustained high RPM operation. The 4.000-inch stroke provides the displacement geometry preferred by engine builders developing maximum torque across the RPM band while maintaining compatibility with LS family block dimensions.

This crankshaft features a 58X reluctor ring for electronic fuel injection and ignition timing control, enabling precise engine management in modern LS conversions and custom builds. Internal balancing eliminates the need for external balance weights, simplifying installation in vehicles with existing LS engine mounts and reducing parasitic losses from balance-shaft systems. The 1-piece seal design minimizes oil leakage and extends service intervals. Forged construction resists the fatigue loading common in turbocharged, supercharged, and high-RPM naturally aspirated platforms where cast iron crankshafts fail prematurely.

The Apex series from Callies targets engine builders and enthusiasts developing performance LS builds—from street applications requiring reliability under boost to track-focused platforms. GM LS-series engine swaps, engine rebuilds, and performance modifications in trucks, hot rods, and sports cars benefit from the fatigue resistance and precise tolerances of forged construction. Engine builders specify 4340 forged cranks when original cast designs cannot safely handle increased boost pressure, nitrous application, or extended RPM operation.