Originally posted by PA 3L SVT:
Actually, it was my understanding that (for at least some significant portion of the Duratec's manufacture) Ford installed single plats on factory engines.

However, there was some reason behind this: The plugs used had platinum on the center electrode of the front bank set (where the plugs fire in a conventional direction) and on the ground electrode of the rear set (where plugs fire backwards to conventional ignition



I have seen single platinum on one side and double on the other. Never seen a reversed platinum.

"Those who cannot remember the past are condemned to repeat it" -George Santayana