Radiator caps and pressure

[RGSchmitt]

Hi all -

I'd be curious to know the direct source of data that the older Mopar
engines are "designed to run" at a particular (small) range of
temperatures. I note there can be about a 150 F degree variation
(more than 100 C) in US ambient temperatures. Certainly a design
challenge for the Chrysler engineers of the '50s-60s. And to judge
by roadside observations 30+ years ago, not always met.

Bob