This is the same thing I have going on with the same gaskets, I brought this up to Greg which he took a lot of time to try to help including offering new gaskets but which gaskets work best on Indy big block heads and valve covers? Indy's leaked out of the gate. Superformance lasted the longest but still leak when I ran the valves a couple times.
Mike you have the #3186 gasket which was designed with the intention of it being "The Gasket To Use" with the Indy heads and valve covers.
As I stated in our conversations there is something going on with the components you are using. Either flatness, valve cover hold downs or something. Heck, it could be something else leaking making it look like the valve covers.
You never let me know if you wanted to try a set of the Carbon-X gaskets..... the offer still stands.
