Quote: How does the inside of the intake manifold look? The reason I ask is that a few years ago my son had about 1/4 inch piece of an intake valve break off on Number 3 cylinder. It made its way across the intake manifold and landed on the top of a piston on the passenger side of the engine. Had to pull that head too so we could get the piece out. So one port could be leaking and then being sucked into the other ports.
