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I use Permatex Ultra Blue gasket sealer for the thermostat housing (and water pump). No gasket. The most important thing is to let it completely dry for 24 hours before adding water. Works every time! The Right Stuff sealer is really good too. It is however, much more expensive. I save it for intake manifolds and oil pans.
RS
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Last edited by RallySnake; 06-30-2018 at 03:15 AM..
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