I was reading the beginning of this thread and read info regarding spark plug indexing. I was curious as to why not index spark plugs so that the ground strap is at the 6 o'clock position as opposed to the 12 o'clock position. That way the ground strap is not in the way of the oncoming air from the intake valves. Wouldn't you want the electrode to be unobstructed from oncoming air charge and not have ground strap in the way?