Here's the story. I'm in the process of rebuilding my 3.0 heads, and the exhaust valves had some buildup on them. I used a wire brush to clean them, and I noticed that some of them look like the head and stem seem to be "pulling apart" from each other. There is a small circle like patern in the middle of the valve face. Is this normal??? Are my exhaust valves ready to fail??? I tried a search, but came up empty handed. Help put another Moca back on the road... 
