many, many years ago when replacement 4 core brass/copper radiators were introduced, sometimes they didn't solve cooling issues, and at the time, the consensus was the cores were too close together, not allowing the heat to fully transfer to the surrounding air.
today, i have no experience with one of those [4 cores] that are available, so i don't know if they work better or not.
i mainly get involved with modified vehicles or resto-mod ones, but i like to learn about new ways/things i don't know, or old ways/things i have forgotten about.
if i'm way off base, please correct me when you can !