Originally Posted by lt1silverhawk
I was looking over the images of the spark plugs again and noticed that the spark plug electrode from cylinder #2 was caked with oil/sludge both times. The first instance can be seen in Post #9.
The second instance can be seen (sort of) in Post #104.
#2 seen in the first photo is horrible. 4,6, and 8 are nothing to write home about, but are better than #2.
The other side, at least what can be seen of the electrodes, look good and is what you'd like the color to be like on ALL of them.
There are cases where, because of how hard the plugs are to get to, that a guy will skip replacing those hard to reach plugs. In those cases the plugs that are not replaced can show a lot more wear- but they still should not be caked w/what is obviously oil reaching the combustion chamber. And if the plugs look like that, you can bet the tops pf the piston and the back of the valves will look as bad.
I might have to take back what I said about the oil on the threads being external. If there's enough, it could wick up the threads from the combustion chamber. But if that was happening, I would expect the engine to smoke badly.
The plugs, PCV and hose look old. If it was me, I'd bite the bullet and replace them. The PCV grommet is also old and starting to crack and it needs replacing. Be sure if you do that you don't knock it through into the valve cover. No huge deal if you do (the oil baffle will keep it from falling into the head), but if you're careful it can be avoided.
There's a chance that replacing the valve stem seals will help matters. The cost is low, but it's labor intensive. Plugs, hoses and vacuum lines are all consumables.