Just another point of interest. Just got back from a 20 mile jaunt, mostly at 60 MPH. With the outside temp at 91* I was running a constant 185 degrees with a 160 degree thermostat and a "stock" Cu/Brass 4 row radiator. Running 34 degrees total mechanical advance at 3000 RPM (60 = 3000) and NO vacuum advance involved.
When I came back to city streets and switched on the vacuum advance The twin 16 inch fans held the temperature to 195* but at idle at a stop light the temp went up to 200* and stayed there.
I got out on the corvair and got the radiators and fans out of the back. They look like a no go. They do pull some air but not like I think they shoud or what I thought they did. After looking at the fans I think if I had pulled them and put a mark8 fan on the radiator it would have been enough. BUT I do not want to try that and not have it work out. ( I would have tried if I didnt have that new aluminum radiator that I cant use back there.) Always something . Checking to see if I can fit the mark 8 or tauras fan up front.
The taurus fan has the same motor as the mark 8 but while the taurus has 17 inch blades the mark 8 has 18 inch blades. On Darius's post on his Stude he
linked a post on the fans ,pretty nice read on fans. They flow between 4500 to 4900 cfm (suppositly) I guess it depends on your radiator density of fins.
So far the taurus fan looks to be a better deal for my car. It looks like they out flow many after market fans.