Stick with the stock size. It is more than enough even in the hot weather areas. Unless your an aerodynamicist please don't try to re-invent that which has been professionally engineered. Keep it the same distance from the radiator as original.
So I was correct about the 17" blade being stock size? I have a fan shroud that is 19" in diameter, it was given to me when I bought the truck. Could I use that with that 17" fan, is the the size difference too much?
