It will. There is a Ford service bulletin about this issue about 6 or 8 months old. Just ask about it. In fact someone in here has posted it before. A little investigation of this website will uncover it I just cant tell you where to look.
My GT has 12,500 miles and the service bulletin has not been done, yet. The clatter comes and goes. If left to idle while the engine is hot for a few minutes mine will tap loud then get softer then dissapear to a normal lifter sound. If left to idle longer it sometimes comes back. I am afraid the guys at the dealership might chip my fender paint so I live with it.
Doesnt hurt anything just annoying.