Nope. Without the heavy-duty cooling package or the trailer-tow package or factory A/C, they had minimally, barely adequate capacity for average driving conditions when everything was brand new. These were cheap cars, and Chrysler squeezed every last fraction of a cent out of them that they could.
Blocking them in winter with cardboard is not uncommon just to keep enough heat in.
LOL! Only on cars that aren't maintained properly. That halfaѕѕedness doesn't mean "Wow, that car has a super great radiator! And its engine doesn't put out much heat!", it means the car's owner either can't afford to buy a thermostat, or is lazy and ignorant.
- the /6 block sides shed a lot more heat directly into the air than the V8's
This is a made-up factoid with no basis in reality. I'm not saying you made it up, necessarily, but somebody did. I will happily eat those words without ketchup when someone shows me valid data backing up the claim. Until then: no sale.
your Champion radiator in nothing particularly great.