67 twin turbo dart

racerhog said
Have you tried the Permatex #2 Black to see if it well seal...???
Permatex® Form-A-Gasket® No. 2 Sealant
Or this Next one from the hardwear store...
Permatex 80045 - Google Search

I have used both on those seeping bastards !!!

Might have to try the foam, have the paste, but the first time I didn't out it down far enogh on the threads where they go into the coolant passage.