My bad about the impeller, thought it was the other way around.

I checked my paperwork on my electric fan it states 2560cfm.
I have heard over and many times over about stock clutch fan and shroud set up. I know it works well, but bottom line is it robs horsepower.

Prior I had a stock 350 in the car, good flowing block, had a new 4core, shroud, stock fan and it would still creep up to 220.
All stock filler panels are in place.

At an idle my electric fan is drawing alot more air through the rad, than a stock clutch fan at an idle. And after 25 mph either fan should not even be a factor. Does Flex-O-Lite explain that?

Either way, I know there are guys out there with similar configuration to mine that claim their temp never goes above 200deg. I just wanna know how they are doing it. One last summer at a car show, 68 mild 400 with an aluminum rad from 90's camaro, electric fan, no electric fan shroud. and he said it never goes over 195?? He didnt show me, but i don't know why he would lie about it either.

As far as "the usaul" That water pump divider plate mod did not make a difference for me, 350 or 400. Logical, but it did not make a noticable change.

Maybe I should ask the guys over at PY forum, being how this is no longer a stock setup.
All I really wanted to know is if capping the normal flow from the rear passenger side head and the water pump housing could affect coolant temps.
Also curious if anyone has overdriven their water pump by decreasing the crank pulley diameter?