Pressure relief on '36 852 radiator

Yes Curt, that is correct. L-29 core was not a honycomb originally.
CORDially Mike

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

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, did those rad. cores come from the UK ?

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

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

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.

You should not be loosing too much coolant - the level is usually just around the bottom of the filler neck or just below the filler neck - you can put the hood into the area between the cowl vent and the cowl and then get a flashlight and your head into the filler neck to see the level (putting the hood in the hood holders on the radiator support bars will not allow enough room to see into the radiator).  If you fill too high it will just upchuck the coolant via the overflow.  I would not run a pressurized cap on it as you want the system to remain an open one.   If you live in a large city and worried about heat then a flex fan helps albeit if you have a supercharged car I have not found a flex fan that will fit.   A nice rebuilt engine generally runs 180-ish and gives you a good period of time to deal with traffic prior to getting too hot (but car tends to creep up at long term idle when stuck in traffic to get worrisome).  

Check post below.

Hi Mike,
It is understandable then , that a fuel cap might have worked in a pinch.
So , unlike today, checking coolant is an important part of daily startup.
Live and learn
Thanks
George

The cooling system is not a pressurized system from the factory.
CORDially Mike

The original caps had one 'ear' and are cad plated. I have one in stock if you need it.

My 852 has what appears to be a Farm and Fleet vented fuel tank cap on the radiator.
I have seen r-1 radiator caps listed as an replacement. They are not vented. What is recommended pressure relief for the cooling system, and is there a consensus replacement for the original, and if so, who sells them?
Thanks