However, anti freeze is an excellent lubricant for your water pump and does prevent corrosion in your cooling system. In my race vehicles, I ran water only and then drained it out after the race and added some anti-freeze for the storage time between races. Naturally, I started the engine on the mix to allow it to circulate. Thicker radiators only work well at high speeds, like over 85 mph. When I swapped for a 3 inch thick radiator, it ran much cooler, especially at lower speeds.
Many people ignore the importance of a shroud.
My big block Class 4 was a flaming nightmare to cool down and part of the solution was a properly designed shroud combined with one of those hard to find 8-blade Ford steel fans. Only know-nothing geeks run flex fans or clutch fans. Trust me on this one. I have found Water Wetter to work only when your cooling system is set up correctly and running the temp in the ball park. If you're cooking, it will not perform any miracles.