Do the newer magnum style thermostats flow enough

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So I removed the t stat and went for a drive. Ambient temp is 10 degrees warmer then the last couple days. Temps sit at 170 on highway. I'm thinkin you guys are right and my rad is the problem
 
170 ? That is GOOD. What is the problem? The rad may be the limiting factor in shedding heat (which it should be) but it does not sound like a problem.

IMHO, please look up graphs on engine wear versus temperature before going much further.
 
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