I have a mech. fan on my 440/505" wedge, 28x19 crossflow alum. rad., 6 blade 17' fan. I am not having cooling problems, but I NOTICED MY FAN IS ABOUT 2/3 IN THE SHROUD. I can remove a spacer I cut down to 1/2" thick, and just about center the fan , as far as how far its sticking out of the...