Well, drove on out here to Columbus today and noticed something that's never happened to me before. The engine was not running hot. In fact, with my cooling system set up, the temps never got above 160, but run at a consistant 140 degrees. That's in 85 degree weather, doing 65 on the highway at 3100rpm. Is this too cool? Should I add a restrictor to get the temps up a little, like to 160-180, or should I just leave it alone?