6.0L / 6.4L Ford Power Stroke Stage 4 Billet Camshaft6. 0L 6. 4L Ford Power Stroke Stage 4 Billet Camshaft Extreme Competition use only. 060" Piston fly cuts required. RCD 120# Valve springs required to prevent coil bind valve float. 1. 850" installed height RCD Chromoly Push Rods Required. Blueprinting of cylinder head required to ensure valve installed heights and to prevent coil bind Optimized valve timing, substantially increased lift and duration for maximum torque, horsepower in competition