Did it not sound like that when you picked it up? If something was dropped in there I don’t think it would take a week for it to make noise. First time it was started you’d have heard it I imagine. I think it’s going to be timing chain related. Ford Performance Camshaft Drive Kit GT 2005-2010Would spark plug debris falling into the engine cause it?
Bump.A video of the engine bay with the engine running would be very helpful to us.
sorry to hear this matter, but Hey it could be other things. have you heard the sound around the exhaust manifolds because perhaps its an exhaust leak from a blown exhaust manifold leak. that can sound like a tapping sound, I know i've had one on my cobra jet. my .02worth.