Originally Posted by
sergechronos
This. Just, this.
Based on how bad the pictures look, I'd spray the combustion chambers out with brake cleaner or similar and see how bad it is in there, but if you have to take it to a machine shop, expect somewhere in the 350-400 range for a 5 angle valve job. While that's being done, you should get the VSS replaced, and have the valve guides checked for wear. If the valve guides are worn, can get expensive but it's better to replace it once. Total cost of my head job with valve job, guides, viton VSS and everything was 685 with them acquiring the VSS and guides.