Hey guys,

I've been looking for a few days now on a t-stat for my 351m. I can't seem to find one anywhere. Does anyone have/know where I can get one of the motorcraft rt-139 or rober shaw 333-192 t-stats?

 

The 351C/M/400 takes a special thermostat with a kind of collar around it. A 192-5°F thermostat is the one to use. Use only the Cooper-Robertshaw thermostat. This has been discussed many times in the 335 series engine forum.

Where to buy a 335 Series thermostat
3 options:
-Find a dealer with a RT-139 still in stock.
-Robert Shaw 333-180
-Napa THM 297

Ck the local Ford dealer, I was able to track down a dealer that has the RT-139.
It’s a dealer in Kansas, but they will ship it to you, Bob Allen Ford 1(800)676-0675

Thanks ND.

 

Perfect fit! Yep I am well aware of the specific t-stat we need. It looks like that Napa will work great. It has the skirt at the bottom that I need.

Thanks a ton! Putting this in my notes. On a side note, I found a motorcraft on the ford parts site. Couldn't find one anywhere else. 9 bucks.

 

Just for future reference, I bought mine from rockauto.

 

Here are some more "notes" got you....

https://www.ford-trucks.com/forums/1...then-some.html

 

bah! I just looked at those yesterday! I missed that napa part.

 

Just curious, which one did you get? I have been looking at those today, but I didn't see any with the skirt on it.

 

I don't think Robert Shaw is still branding the good thermo. You can get it from Mr Gasket. a 192 is good for the winter but not for summer.

 

I was starting to look at those to. I'd like to get the high flow if possible, but if not i'll settle with stock. I'm pretty sure at this point what is in it is one of those other ones that don't work to well to cool the system down. It gets hot when idling. Doesn't "overheat" but to hot for comfort.