I just discovered this problem when I removed my upper radiator hose and noticed the thermostat was cocked inside the housing. I will have to try the thicker thrermostat as mentioned above, or a shimmed style gasket, or even have a couple of "stops" spot welded onto the base of the housing neck. I had some curious cooling issues with my '67 400 HO, and now I can see why. I hope more of you have run into this and have possibly come up with a solution! Oh yea, tried a couple of the oring type seals, and they didn't work...too thick.
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