It's some kind of clip. What is it from?? I pulled off the valve cover and it was just laying in there next to a push-rod.
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bogus one said:Looks like it's a vacuum line clip.
You may have bumped it off the last time you did a valve adjustment.
Do you see any wear to any internals?

looks like the clip that keeps the fuel and return hard lines together. Mine are on the front of the valve cover. Maybe.