Do the newer magnum style thermostats flow enough

11.2 said

If it stayed at 195 I would be ok with it but it doesn't. To make a long story short I've been running a clutch fan and I've tried a couple electrics. I think I have a water flow issue, I'm running a 180 thermostat but my lowest temp I see is 195. This is with a clutch fan down the highway on very cool days. if the system was working properly it should be running around 180.
New rad and new water pump, changed thermostat, no change. I here there are hi flow t stats, thinking I might try one if I can find one.

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I think if I were you the first thing I would do is pull the stat and run without it for a bit.
If it still gets hot without it then you know for sure you have a non capable cooling system instead of a flow issue caused by the stat.
I'm betting you'll still have the heating problem though.
Stats and housing were designed for enough flow to cool an engine under pretty much any circumstances.
It's usually radiators that get mismatched by accident or design.
Usually I'm the last person to tell someone to go buy something else, but in this case I'd bet you it's the radiator.
Running it without a stat will prove it.