Did you know race cars are not allowed to use antifreeze, I have been racing the same racer for 20 yrs with an aluminum rad and it still dosn't have a hole.
by running water you car runs cooler, your rad cap raises the boiling point by 3 degres for each pound on the cap so a 10lb cap would add 30 degres to the 210 boiling for plain water ,so you car could safley run at 240 before a problem, and water pump bearings are sealed and are not lubed by fluid