yes, as George says, the position of the fan in the shroud is important - those plastic shrouds don't necessarily wind up right, it's important that the length of the fan blades fill the shroud opening with minimal clearance, and that the fan [or shroud] is positioned so the center of the blades is at the opening, must not be inside or outside the shroud -
this is one I put on a buddies 56, works fine - on my 58, with a factory shroud from a 60's car, I had to
add a spacer behind the fan, that actually put it too far in, but it works fine so I haven't bothered looking for a shorter one .... speed up the fan by getting a smaller pulley on one position for a shorter belt, but you shouldn't need to do that using standard stock stuff
Bill
