So according to the coolant & water mix, it seems more coolant will lead to a higher boiling point, but its disadvantage is it doesn't transfer heat out as quick as water. Ummh! When the coolant/water combination boils, will it create more pressure (its volumn expands when boils) and adds the stress to the block?
So is it more desirable to have a lower boiling point (engine runs cooler with more water), but it'll boil easily? Or is it more desirable to have a higher boiling point (engine runs hotter "looks more scary on the gauge" with more coolant), but it'll boil slowly? For example, a 240 degree F boiling with more water and a 270 degree F boiling with more coolant, which will cause the warping easier?
As Rod mentioned, corrosion is my concern, too, especially when I have a radiator hose made out of steel.
I can go with bigger radiator (even I'm using the stock size aluminum radiator with 3 electric fans, 2 pullers and 1 pusher, a 13 lbs cap, a 175 F thermostat), but I'd like to keep the A/C condensor in front of it. I just bought a vented carbon fiber hood and hopefully it'll help vent out the heat much quicker. This 1UZ in the SC400 engine bay really soaks heat. In the hot weather "85 F" and with the engine leaving cold overnight, the engine and its surround get really warm, and it feels like the engine has been running for awhile in the winter.