Here's a good example of what's happening.
Sounds random to say they were bent.Valve float makes sense. I thought it might be to much lift causing the damper to bind and cut the grooves. I should of mentioned that the heads are used and when I bought them I received them disassembled minus the valves, they where probably bent. The heads now have had a new set of shims, set of valves and seals. Thanks for the info.
Here's a good example of what's happening.