rspears, I've never scfm listed for any fan. Maybe I need to do more research. I have a 3" shroud and attached part of another shroud I already had to make it a full round shroud. The fan, a flex type fan, is about 1/2" out of the shroud at the back. It made no difference. The radiator is "new", 1100 miles or so, so I'm sure it's not plugged. The water movement in the radiator seems to be good. I've never heard of a good way to check the flow of a water pump without taking it off and inspecting it.

techinspector1, neat tech article, especially interesting about the water pump impeller. I'm wondering about mine.

Henry Rifle, I've thought about taking the pusher off & checking the heating problem.
Thanks to all, Rod