Whats up with these exhaust valves?

19DUSTER73 said
The valves did not look that way when new. In person it does look like they are blistered. I'll fool with them some more tonight. I'll also try and dig up some info on the valves. They were purchased a few years ago and I can't remember the details on them.
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Well, that makes a difference. On my iPad they look like materiel was pulled from the face of the when it was machined. If they look like blisters then it is materiel transfer from somewhere else.