After changing the plugs last year, I noticed that some oil had seeped into the spark cavities on 2 of them. The boys at BMA did me good, got me the gaskets and I finally got around to putting it in this weekend. 111K Miles on this bad boy, nothing but Mobil1 for last 5 years. Take a look at this engine, I am impressed at how clean it is for such an old beast.
Scott
BTW - the real problem was the gaskets surrounding the plug holes - it was very brittle, new gasket was rubber.