Part of the width from the engine size increase in the 4.6 must also come from the fact that the stroke on a 4.6 liter is 3.54 inches and its only 3 inches on a 5.0 liter motor. I am guessing that this adds to the deck height in the 4.6 motor. But i am not engine builder. I agree now the rest of the width must be in the OHC design.