Oil in spark plug holes

[cav]

I have '89 FSB, 5.8 engine. Took her over this am to get the inspection/IM. Failed the emission. Long story short---Got new plugs ect. When I pulled our the 3rd and 4th plugs there was oil in the plug holes (lots of oil). The truck has been running fine with no missing or such. Had not noticed and differnce in performance at all. I cleaned out the holes and ran her for about 20 min with the tune up. Any guesses as to where the oil come from?

 

[miesk5]

yo,

Hopefully, it's just da Valve cover gasket leaking above the spark plugs;

Next is PCV Valve; check for oil in air filter &/or housing

 

[cav]

yo,

Hopefully, it's just da Valve cover gasket leaking above the spark plugs;

Next is PCV Valve; check for oil in air filter &/or housing

Thanks Miesk5, you always seem to have the answer----I'll check everything out today, Cav