Originally Posted by Neil
Permatex makes an antifreeze specific sealer you can use.
iagree up
Their part # is 22071, works good up, last a long time scope I use it on the gasket (both sides) on the thermostat housing only, not on the water pump to block gaskets twocentswrench

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Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)