Just watched the video and have to admit that its quite an odd sound....the vision I got when watching/hearing it was of something going "scrape..scrape....tap....clank...." inside the back of the valve cover.
Thats what it sounded like to me....what could do that in there? Is that even possible??  Then again the sound could be the bottom of the air cleaner banging on the arm it sits on.....but it seemed like its coming from the valve cover....
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