I have a old RV Turbo kit on the 440 in my '85 W-350 Crewcab. It does really well for it's age and puts out 7psi max boost, on a 10 to 1 440 that's plenty for me


'85 W-350 Crew Cab, Turbocharged 440, NP435/205, 4.10 D60f/70r