Make slowboy not so slow

[asshanson]

I noticed quite a bit of buildup on both intake and exhaust valves, but it's weird looking, like it's only built up in certain spots.

Also, when I took off the head, I noticed the headgastket was pretty slimy with grayish oil all over, not sure if it was leaking really bad or if that's just from when I took off the head. Maybe thats why it was burning so much oil, and not the rings? It was on both sides of the gasket too, not just the top. Would a really blown headgasket cause a lot of oil burning or low compression? I know my turbo was burning some oil, but that doesn't explain the low compression.

I'm taking the head to a machine shop tonight after work and hopefully find out if it's ok.

What's a good way to clean up those pistons? wd 40 and a rag?