Pressure relief on '36 852 radiator

Thanks for your response, John,
I did install a non-pressurized cap and it seems to be running fine. I checked the radiator temp on a hot Chicago day with an infrared heat gun. The radiator seems to run about 185⁰F with no hot spots, and a 10-15⁰F difference from top to bottom.

In my opinion 180+ is too hot. Car should be running 160 with a 160 stat. I also use a 6 bladed fan from Summit. Rad. should be cooling 20 to 25 degrees top to bottom. That is my experiance with my 35 Auburn. My L-29 Cord runs this temp. also.
CORDially Mike

I should add that the rad. core on my 35 Auburn has been replaced with a high efficiency core and the L-29 Cord has a high efficiency core and made thicker. I don't like to screw around with overheating cars!!!
CORDially Mike

Mike, did those rad. cores come from the UK ?

No, local rad. shops. Nothing special, just more fins and tubes. Granted it was 15 to 20 years ago. Also have always used Rad. filters.
CORDially Mike

Mike, so these are modern cores as opposed to the original 'honeycomb' variety ?