Thanks again for all your sound advices ! I want a reliable, good fuel economy but something that wont die at each hilly road Is it enough to give a pleasant ride with a 8000lbs ( camper in box ) truck The point is: having modified gas engines all my life, I cant figure what a 300hp Cummins will give. Should I go for HX35W or HX40W turbo instead of my HX1W. I started some different threads, because I need to learn !ġ) modified VE pump ( 1 turn on powerscrew,120deg on diagphram and 2 turns on smoke screw as decsribed somewhere )