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Message: [QUOTE="BogginF350, post: 1300532, member: 621"] Stage I From hot street trucks to dump trucks. Drop in replacement with corrected valve timing, increased lift and duration for efficiency VS the OEM grind that was designed to promote EGR Flow. Works with stock valve springs and RCD upgrade 120# springs. No Piston fly-cutting required. RCD Chromoly Push Rods recommended. Duration 170 IN / 185 EX Valve Lift .385" IN / .368" EX Stage 2 Hotter Street use. Drop in use, no piston fly-cuts required. RCD 120# Valve springs recommended for competition use. RCD Chromoly Push Rods recommended. Optimized valve timing, increased lift and duration for maximum torque, horsepower and mileage. Duration 181 IN / 195 EX Valve Lift .412" IN / .400" EX Stage 3 Hot Street / Competition use. .060" Piston fly-cuts required. RCD 120# Valve springs required. RCD Chromoly Push Rods Required. Optimized valve timing, substantially increased lift and duration for maximum torque, horsepower. Duration 187 IN / 208 EX Valve Lift .467" IN / .450" EX Stage 4 Extreme Competition use only. .060" Piston fly-cuts required. RCD 120# Valve springs required to prevent coil-bind / valve float. RCD press-on valve seals required. 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 vehicles. Duration 197 IN / 218 EX Valve Lift .518" IN / .500" EX [/QUOTE]

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