| Re: Spark plugs: seven tan and one nasty black I believe the problem has been discovered. Upon pulling the valve cover and carefully looking at the intake manifold gasket, we discovered that the portion around intake runner #2 was moved outward about a quarter inch. The impression from where it had originally been placed was visible. What appears to be a rip in the gasket is visible on one side. The gasket holes are not centered on the manifold bolts. So it looks like we will be replacing the gasket. In the first picture, the upward movement of the Felpro gasket is apparent. In the second picture, what appears to be a small tear is visible. Any ideas why the gasket would fail? Replacing the gasket would seem fairly straight forward, albeit time consuming. Any tips or recommendations would be welcomed. Thanks to all for the good analysis and tips and suggestions. Chuck |