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The one I see on Summit is a Ford Performance PartsI'm sick of trying to seal the bleeder screw, or whatever the hell it is, on this non-stock t-stat housing. After my 3rd failed attempt, I'm ready to find a no frills, basic, t-stat housing that works. I've read a lot of bad reviews about the OEM replacements on Summit...
That one is listed as "not available"The one I see on Summit is a Ford Performance Parts
https://www.summitracing.com/parts/fms-m-8592-b302
I was thinking the same thing. Should be a 3/8 NPT plug that you can get at HD.That screw is not original. I'm guessing it's straight thread while the tstat housing is tapered pipe thread. That's probably why it doesn't seal.
Because of this comment, I've given the old housing one more chance. There's definitely an o-ring groove above the threads. Thank you. I didn't know there was a difference in sealing straight threads vs. pipe threads. Put an O-ring on it, thread sealant, and gasket maker on it. The housing is definitely a nice quality housing with a Ford stamp inside. I do think the screw is the original design. So, I'm hoping this will work some magic. 5th time's a charm!If it is a straight thread, it is missing the O ring that enables straight threaded pressure connections seal...