Radiator Size ????

Yeah, not all that is true.

Two cores with big tubes will not always out cool 3 cores with smaller tubes. You actually have to do the math, figure out the surface areas, flow rates, number of fins, all of that. There are 3 core radiators out there that will out cool large tube 2 cores. The factory ran 3 core radiators too!!!
That's true. But for most street applications it works well. I had a nice aluminum 3 row in Vixen for a while. I couldn't STAND how ill fitting it was. I was able to get a factory three row from a good member here that was in almost new condition and it cools every bit as good and fits SO much better. But you're right. The two row theory isn't right for every single thing.