[JLMounce]

There's a reason the 2nd gen f-body has a much larger radiator than the first gen. There's simply not enough frontal area on a first gen factory sized radiator.

Big tubes and additional cores only get you so far. After the air passes through the first set of tubes and fins, most of the cooling that can be done already has. Each subsequent core of tubes and fins is dramatically less efficient as the delta between the air temp an water temp decreases.

This is why you see modern radiators thin with large amount of frontal area. It simply cools better. Of course it helps the modern EFI systems can rotate idle and skip cylinders here and there.

If I was to go back 10-15 years and catalog all of the threads on this forum discussing cooling issues, I would lay odds that the majority of them revolve around first gen F-bodys and early A-bodies. Both notoriously under radiated.

The rads are so small, that with anything much over stock power, you need massive CFM at idle to keep them cool.

My setup works okay. It used to cool fine at idle with my old engine, but I added quite a bit of power with the new engine. Now in temps about 80 degrees it will creep ever so slightly at idle. The fan is rated at 3300 cfm and I've taken pains to make sure the shroud is sealed as tightly to the core as possible and have also taken steps to reduce the amount of underhood air that can circulate back in front of the core between the radiator and the core support. This is actually my only complaint with the Cold Case radiator. The factory AC rad I took out of the car sat up against the core support with about 1/4" of room. The Cold Case has about an inch and a half of room between it and the core support, allowing hot underhood air to circulate in front of the radiator.