I have a 78 280Z... one of the bolts that holds the EGR valve on broke. So there is only one working bolt left. I assume I can replace the bolt, however in the mean time I need to drive the car as it is my main automobile. So, anyway when I bolt the EGR on with only one bolt it actually seals pretty good just a minor very minor leak out the side that's missing; a bolt. (I tested it with soapy water with the engine running.) My question is can I use a copper sealant such as Permatex Ultra Copper to seal this up and help clear up any EGR leaks??? Will this hold if I do this??? I know that copper sealants are ok for Exhaust manifold gaskets and such so I'm just wondering if it will hold up over a period of time to use the Copper sealant to seal up this minor leak that is left. Obviously I mean sealing that gasket too. I would use it on the inside and NOT just apply it to the outside.. This much I do know... If anyone has any experience with this problem or sealing it up. Any help would be great... Thanks in advance, Jeff..