Vehicle running warm 360 la

The high flow stats. There were four that I know of being sold: Robert Shaw, Mr. Gasket, Milodon, Stewart Components. Most likely all made in the same factory, only difference was the 'box' they went into....
I even have been using them for decades. I even have a rare 140* marine version.
The all brass construction pic in post #34 is the original US made stat.
The newer ones with the s/s bridge across the top are the Chinese ones. I have had a few of these that failed to open. The reason is because the rubber seal in the base of the large cup is a little tight. I dribble some ATF in there to lube the seal & after a couple of heat up/cool down cycles they work fine & are reliable.