Black64, thanks for the chart. It will come in useful.

SRT8Challenger, that's kinda what I found out from tidbits off the Internet. Thanks for the confirmation.

Besides the problem that pusher fans will block air flow, I think I understand now why they are not generally as effecient. I mounted my SPALs as pushers(just for testing)and fed them power to reverse rotation. Although they blow rather well, the air blows out every crack and hole between the fans and the rad. I guess the rad fins act as a restriction and the air flow seeks the path of least resistance. So if you don't completely seal the fan shroud to the rad, you loose a ton of airflow. As a puller, I don't think this would be as much of a problem as long as you had a decent shroud.

Anyway, I spent a few hoours at the wrecker today and found a set of dual 11" fans and shroud from a '95 Contour. They fit my rad quite well and I can sqeek it by the power steering if I remove the decorative nose cone. Not sure what the airflow is on these but I'm going to give them a try.

Thanks for the input guys.