Radiator pressure testers are simply hand air pumps that attach to the radiator like a pressure cap. Test the system at whatever the manufacturer's rating was originally- - - - -most 1950s systems were either 0 PSI, 4 PSI, or maybe 7PSI. "It's not rocket surgery!" Here's an inexpensive kit that will test just about any cooling system or radiator cap made in the past 60 years or more:

www.ebay.com/itm/336134889002?

Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!