There are only a couple of ways oil can get into a cylinder.
I've been ranting and raving about worn rings todays, so I'll list that one first. Worn rings simply allow oil to stay on the cyliner walls where it usually burns up.
The second way is through the top, down through the valve stems.
now, unless there's something on an H I don't know about - oil BUBBLING out of a spark plug hole... that's pretty extreme no matter what the cause.
The engine almost HAS to be hemoraging blue smoke when you run it, and I find it odd that you didn't mention that...
Is it?
Oil could just be dripping down from the valve cover to the plug holes. Are you SURE it's coming from inside the cylinder?
Soot build up can also be caused by running very rich, with lots of carbon coming out as black smoke from the exhaust.
I guess you need to describe it in a little more detail.
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