Torque specs for the most part are not in the repair manual. That frustrates me as well. Sound advise above. Use gasket sealer and get'em good & snug. I don't think I've ever used a torque spec on a thermostat housing.

Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.