I have a 86.5 supra with a 7mgte and I pulled the head yesterday when a leak down test forced coolant out of the radiator on every cylinder. I found the head to be poorly surfaced, looks like it was done with a hand sander or grinder, and it is also warped. This explains the coolant problem but I also found that the valves in cylinders 3, 5 and 6 have heavy oil/carbon deposits. I also noticed that the spark plugs from these cylinders were covered in oil as well. I know my engine had been burning a little oil on startup, it used to burn a lot of oil on startup but i replaced the valve stem seals last summer. I'm hoping that the oily valves are caused by bad valve guides but someone on another forum thinks it looks so bad that it must be the piston rings. Any thoughts? I had good cylinder compression: cylinders 1-6: 170,170,182,175,180,180. (note the higher compression on the cylinders that have heavy oil/carbon deposits)
Here are some pictures:
http://www.flickr.com/photos/61419666@N06/