El;
This is what I have on hand.........
4 or 5 Ford water pump pulleys,all 6" diameter (outside to outside measurements) and 2 3/4 "tall"...single groove,they are all the same pulley, how I ended up with that many is anyone's guess....
Then I "found" another, this one is 5 1/4" diameter,but it is actually a 3 groove pulley, if you were to put it in a lathe and cut the inner most groove off (I've done this a number of times)( the groove closest to the motor) it would be 2 1/2" "tall". the outer most (away from the motor) groove is a small groove, maybe for an emission pump or something like that...You could use it "as is" for testing purposes and then if it helps, modify it or try to find another the same diameter.......
The other pulleys I have are 7" diameter and 2" or less "tall"....that wouldn't help you.......
Let me know what you want to do, I can box up the 3 groove as well as one of the 6" pulleys if you want to expirement with them.....
BTW: checked on my set-up with my Mustang street car,this is what I have;
Griffin aluminum radiator, 26" wide total, 21" wide core,19" tall.
water pump pulley is 5 1/2" diameter
crank pulley is 6 1/2 diameter
running an Auto Zone 180 thermostat with 4 little holes in the flange
Flo-Kool high volume water pump
I'm guessing about 25% anti-freeze and the rest is tap water from the garden hose.
18" diameter electric fan I got from a body shop, it had one broken mounting tab and they were replacing it and gave me the old one, it works perfectly, came off an early to mid 90's GM car, I think maybe a Caddy or big a$$ Buick, curved blades, switched by a manual toggle switch mounted under the edge of the dash out of sight...
My water pump pulley is 2" 'tall' and for reference it came on late 60's/early 70's trucks/cars, mostly with no power steering/power brakes,they are the few that had single groove pulleys, you could possibly find one and "shim" it out to match your crank pulley. The crank pulley, I have no clue what it came off of, too many years ago, but I do remember it was a 3 groove pulley originally and I took it to my cousin's machine shop and in about 5 minutes he made it into a single groove pulley!!!!!!!!!!!!!!!!!
Last year's Forth of July parade lasted about one hour and the outsdie air temp was a tad over 100 degrees, temp of the hot pavement must have been 120 or more....Started out the parade with the fan on to keep it as cool as possible for as long as possible, car ran dead-on 180 degress for about the first 40 minutes, then the temp gauge began slllloooooowwwllllyyyy creeping up, by the time the parade was over, about 20 minutes later it had crept up to 200 degress, which I can live with, less than 2 miles down the highway at 50 mph, temp was back down to 180!!!!!!!!!!!!!!
Granted it's not a big block motor (351-W,350hp,iron heads) and it's not in a Cobra (65 Mustang fastback), there's more room under the hood for the hot air to escape in the Mustang than a Cobra and I'm sure a 427 will generate more engine heat than my 351, but it can be done......
During the year or so I "played" with this, I tried 4 different radiators, 3 different thermostats,5, yes,5 electric fans and at least 5 different pulley combo's before getting the car where it's at today....
I wanted it to be able to idle at least 30 minutes while staying under 200 degrees and with the combo I have now, I easily and happily exceeded that.......
Let me know what you want to try and I can send you some pulleys.....or being your in Houston and that's only about 4 hours from me, drive the car on over and we'll change the pulley out here at my house and test it here.
I've never worked on a 427 before, although I've seen a bunch of them....
David