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Old 11-17-2021, 08:49 PM
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Join Date: Oct 2017
Location: Baysville, Ont
Cobra Make, Engine: Mine, small block FORD
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Well it looks like the part in question is called an otter switch, that was the name of the company that made them" Otter " and they are still in business today making switches.
The one in the 289 was also found in Jag XK series and E types as well as others I am sure. Today it looks like you can get a 3 hole plate that is threaded to take a more conventional NPT thread thermo switch. I have the cast pipe coming on my recent order from CSX Parts so when I have it in hand I will figure out what I am doing with it.

As for the exhaust mainfolds............
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