i was driving the stang around and noticed that when i was driving that there was a noticable tapping noise coming from the drivers side of the motor towards the top of the motor it seems to go away when i back off of the gas a little bit but the second i start to the accelerate some it comes back and gets more rapid the more i accel. i really just think its a blown exhaust manifold gasket cause the stang goes through them like skittles due to the headers missing a bolt on both sides. would oil getting on the header and gasket cause it to fail?