Leaking Thermostat Housing. Thinking on billet with O Ring

Rocket said

Do not tighten too much. Look to the factory torque specs.

To ensure a Good seal file the intake and thermostat housing flat. Fill in any pits with epoxy and file flat again. Use a good o-ring seal or gasket and torque to spec. If the bolt holes are not blind, use a sealer on the threads.

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I also had to file the alum. pump housing down, my fault I overtightened it in the first place. Cutting the stat cover down .060 to the inside edge of the bolt holes, leaving a raised ring to press harder on the gasket before the rest touches when pulling it down did the trick, and made my own gasket. pretty cheap chrome one now good.