[fordracer]

I would use RMI 25. I use it in my Turbo Buick. With no other change it knocked 10 deg. off my temp. I use about 98% distilled water and the rest for anti-freeze. Adjust anti-freeze levels for your part of the country. I live in Houston where it rarely freezes. Remember, the green stuff is not coolant. It is anti-freeze,detergents, and lubricant. The RMI takes the place of the lubricant and detergents. STAY AWAY FROM DEX-COOL/EXTENDED LIFE CRAP!!I cannot count how many radiators,intakes, and even head gaskets because of this junk...

Also check your radiator cap. For every pound of pressure the boiling point goes up 3 degrees. You could search for one higher than the installed 15-16 lb cap you probably have installed. I wouldn't go over 20 lbs. though.

Also remember, that number stamped on the thermostat is the point it JUST STARTS TO OPEN. Stick a 180 in there if it doesn't already have one. If it does, try a 160. JUST DON"T LEAVE IT OUT COMPLETELY! The thermostats job is to keep fluid in the radiator long enough for heat transfer to take place. Without a thermostat the fluid will not be exposed to enough airflow.