[blown 72 gmc]

Hello, I ran a four row copper radiator in my truck with dual flex-a-lite fans and big block blower. It only ran warm in the heat of summer the rest of the time its not to bad. I was told that air flow is your main issue getting as much air flow across the radiator as you can is critical along with a high volume water pump. Chances are with a good hot summer day and a big block your t-stat wont be closing much any way. I know they make aftermarket fans that pull more than mine might check them out look for high cfm pullers. PM me if your interested there is a guy in missouri that makes a nice 2 row aluminum that is for 67-72 that is finished really nice. This is what I plan on using when I go back together.