Quote Originally Posted by shawnlee28
Basically on most hot ,hotrods its usually the biggest radiator you could possibly fit is usually the right size.
Absolutely right!

There is a disciplined engineering approach to designing air-oil (or water) heat exchangers. It is not as easy as a couple of equations however. Especially not for a car where the heat loads, air and water flow rates etc are not constant. If I was going to make my own I would probably go take a look at the specs on brass or aluminum ones out there and basically copy that.

Kitz