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Coat the new gasket very lightly with a suitable paper gasket sealant, such as aircraft grade gasket sealant. Use it very sparingly. Allow it to get tacky before installing the housing.

Then install the new gasket on the thermostat housing. Put the long bolts through the housing and put the gasket over the bolts to help keep the gasket aligned as you insert the thermostat housing back on the cylinder head.

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