running too cold?

Hello everyone,
I had my Challenger out for a drive today on a nice 70 degree day, Like always, the temp gauge reads on the low end of the non-rally gauge. When I got home, I checked it with an Infared thermometer, it read 170 degrees. I checked the rad, thermostat and upper and lower hoses. Even with the A/C on, it still does not get much higher on the gauge. Is this too cold for city driving?
340 stroker, 371 ci.
auto trans
26"
3 row aluminum radiator
factory fan and clutch
185 degree...

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Author: Litchkar