Coolant flow

One other consideration is altitude. I live at 5800 feet and air density is 20-25% lower than at sea level. Thiis reduces the mass of air that flows through the radiator for any given CFM rating meaing that you need 25% more air flow to get the same heat removed. Luckily engines make less power at althtude for the same air density issue, but cooling is still a concern. But I do wish I had that HP back that i lost due to altitude. My compensation is that I have mountains to look at and great roads to drive on!