I dont know guys… A lot of speculation here… And Im sorry, but I dont think its correct.
I have personally pulled my radiator out of my 02 Expedition and replaced with an actual SVT Lightning radiator. And I can tell you, the SVT radiator is significantly larger than the stock Expedition ones. Im pretty sure the stock Expedition radiators are single pass, whereas the SVT Lightning radiators are a double pass. I should have taken a picture, but didnt think about it at the time.
When I bought mine I replaced a bunch of cooling item. I went with a true SVT radiator, a Navigator water pump, and a better thermostat. I have no issues with my temps, and thats in 100* weather with the A/C full blast front and rear.