[T3] Valve Covers

[Know One]

Since it's quiet and my T3 is sitting for what is most likely my ineptitude, here's a question.

During my recent valve adjustment and tune-up the right cover leaked badly at the front bottom side. I waited for it to cool off, re-did it and put it back on. It leaked again. Obviously I'm doing something wrong.

What do T3 folks use to prevent leaks at the valve covers?

Jeff '67 Sqbk