I can't figure why so many of you guys put all this money in your cars, engines, and especially cooling systems, then try to cheat and cut corners by getting cheap, garbage parts. And I still don't understand why you guys get all crazy on your cooling systems, but never put a real deal, high flow water pump in. I still have my original, 150k+ mi, stock 30 yo cooling, other than a Flow Kooler water pump and 160° thermostat. Also, I run 50/50 water/antifreeze. I cruise at 162°-163° and spike momentarily at 167° when my fan comes on. The highest I've ever registered on my scanmaster was 179°, and that was after several consecutive wot hits with the weather in the high 80s. Afterwards, within 15 minutes of normal driving, I was right back at 162°-163°.
After hearing all the chatter on this board about RMI 25, I decided to add a bottle to my cooling system after recently flushing it. Now, I'm cruising at 152°-154°. So to sums things up, get a real water pump and add RMI 25 to your system.
Plus, if you go to the Flow Kooler website and do some reading, you'll see there are other benefits to it; other than just cooling.