hello people; I got a stupid question here. If you have a good cooling system (Alum.rad. and pump) why would you want more fan unless you just want to cool it faster or you drive in a parade doing burn outs?
IBBY
The dual fans aren't really required unless you're running a front mount.
And for that matter, aluminum fans aren't really ever required. The problem most run into is badly maintained radiators.
A stock radiator will work just fine behind even the largest of front mounts if it has a clean core. That's the secret. Most don't even realize that after a dozen years or so most of the bottom third of a radiator can be totally clogged and useless.
All I ended up doing was getting a new core for my stock rad. and no more cooling problems at all. This with the huge V2 front mount and dual ramcharger fans.
I also tried bandaiding the problem. My stock fan finally bit the bullet, so I bought an aftermarket single fan. It couldn't handle the job. Bought the dual RamCharger fans, and they didn't really work all that well. Then some slick backyard mechanic showed me an embarassing test. He said run your hand down along the inside of the hot radiator from top to bottom (fins not tanks). I got just a little over half way down and the fins started turning COLD!!

The bottom half of the radiator was clogged.
Got it re cored with stock GN core, and all's cured.
As for aluminum radiators, fine, if you want to spend that kind of money.
The worst radiator I ever owned was a very expensive Griffin/Griffith(whatever), purchased in the middle of the above adventure. Finally found out the problem. Those expensive racing radiators are made for racing. VERY high "fin count per inch". You need to be going well over 100 to get any air through them.
Lessons learned:
A good stock radiator, stock fan will cool just fine with a SLIC (does on my 87)
A good stock radiator, dual fans or real good single will cool just fine with a FMIC (does on my 86).