Vehicle running warm 360 la
I believe Stewart Manufacturing bought the Robertshaw tooling. They no longer directly make them in the musclecar-era Mopar size, though. They only service the '78-up style (Chevy-size) thermostat; the earlier large-diameter Mopar stat they sell now is a Chevy part glued into a plastic disc. Regardless, even NOS ones are usually far less expensive than the Stewart, which was around $25 last I checked. I won't speak to/against Stewart's quality because I've not used one, but Stewart has a fine reputation and is an Upper Michigan company so I'm a bit of a fan.
I'm glad you mentioned Stewart, @RustyRatRod, because someone else offers a similar-looking thermostat: Mr. Gasket. BUT, the Mr. Gasket part is an overseas copy, and a really poor one. It's obvious that it's not a Robertshaw/Stewart-made unit because it is not all-brass/copper. The frame is nickel-plated steel. They have a staggering failure rate--probably greater than 75%. Do not waste time or money on the Mr. Gasket thermostat.
If it's not all-brass construction, keep looking. Trust me on this. What you want looks like this:
PLEASE do not PM me asking to buy a thermostat. Thanks.
It's the OE design Mopar used in the musclecar era. I have 160°/180°/195° NOS Mopar thermostats in boxes with the parts-books numbers from '66-'80 or so (both diameters) and they're all of that design. It's also what came out of my untouched 15K-mile motorhome 440. Chrysler's vendor was Robertshaw. Robertshaw also sold them in the aftermarket for a long time; I was still getting them from Summit in the late 1990s but they're all gone now. The brand names mentioned above were all rebranded Robertshaw; I have Atlas, CarQuest, RoadKing and Texaco versions. All are identical. There are also OE Ford and I-H versions. Apparently the 351C and some Cornbinder engines are very finicky about thermostats, particularly the Cleveland.
I believe Stewart Manufacturing bought the Robertshaw tooling. They no longer directly make them in the musclecar-era Mopar size, though. They only service the '78-up style (Chevy-size) thermostat; the earlier large-diameter Mopar stat they sell now is a Chevy part glued into a plastic disc. Regardless, even NOS ones are usually far less expensive than the Stewart, which was around $25 last I checked. I won't speak to/against Stewart's quality because I've not used one, but Stewart has a fine reputation and is an Upper Michigan company so I'm a bit of a fan.
I'm glad you mentioned Stewart, @RustyRatRod, because someone else offers a similar-looking thermostat: Mr. Gasket. BUT, the Mr. Gasket part is an overseas copy, and a really poor one. It's obvious that it's not a Robertshaw/Stewart-made unit because it is not all-brass/copper. The frame is nickel-plated steel. They have a staggering failure rate--probably greater than 75%. Do not waste time or money on the Mr. Gasket thermostat.
If it's not all-brass construction, keep looking. Trust me on this. What you want looks like this:
PLEASE do not PM me asking to buy a thermostat. Thanks.