I have a freshly rebuilt 400 engine that runs great except it takes unreasonably long to warm-up. After some investigation I found the culprit to be the thermostat stuck up into the thermostat housing. Anyone have this problem? I replaced the thermostat and made sure it seated correctly however I still found it up in the thermostat housing after running the engine for a while. Is there a shim or some reason the thermostat would be pushed upward?
Thanks for any help!
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