Any one installed Ford Motorsports 90 degree thermostat housing with the sensor housing screw on the top?
Just installed mine and just by filling it it leaks around the screw. I used teflon tape so I assume something else is not quite right. Did these have gaskets for the screw?
You can either use the teflon tape or what i do is put permatex on the threads and screw it down. Then wipe off any excess that comes from the top. The only reason its there is incase you might have an electric fan and the sensor goes there or you might have one of the original temperature vacuum switches that goes in there, thats all. enjoy.