I never draw any conclusions from one compression or leakdown test. There can be a small chunk of carbon stuck under one valve....and it might take quite a while for it to come completely out.

I'm not much of an "additive" guy, but I do use a couple different chemicals that work, very well, for me. Buy some Ventil Saber by Lubro Moly (Valve Cleaner) and run this in the gas for a couple of tanks of fuel. Then retest compression.

 

Thanks Dave and Greg. Wil do a leakdown and run the Ventil Sauber for a few tanks and then retest.

 

Took some pics of cylinder # 6 with my usb boroscope tonight.

https://picasaweb.google.com/emantin...eat=directlink



Not the best pics but you can see the carbon on the top of the piston in the first 5 pictures. The next 7 show me trying to go up and down on the cylinder walls - do those little lines look like scoring of some sort? The next 5 are around the valves. The final 8 pictures are the top of the piston again towards the sides.

Based on the pictures, how does it look? Is it time to pull the heads or can I get by with some decarbonizing chemicals?