Originally posted by Art Hazebrook:
Double platinums (PP) are required in the Duratec because of the waste fire style of ignition system. (Autolite - APP764's or Motorcraft AWSF32PP's) It reverse fires the opposing plug the same time it normally fires the intended plug. This causes the ground electrode to wear extremely rapidly on non double platinum plugs.

Do not use Motorcraft AGSF plugs, they extend 5/8" farther into the cylinder than the AWSF's. With the increased compression of the SVT there is the potential for physical damage, placement of the spark in the wrong part of the combustion chamber, and fouling of the exposed plug threads which could make the plug very hard to remove!

For plug wires check www.batinc.net/contour.htm (Magnecor ) or Bill at the Chicago Connection.

Regards, Art quote]




Your information on the AGSF plugs are wrong. They do have more threads but they do not stick into the cylinder any further than the AWSF plug. If you look at them both closely you will see that from the tip to where the plug actually seats ( the tappered part ) the plugs are exactly the same length. A friend of mine photocopied a few pages out of the Motorcraft spark plug manual and heres what it says in the " second letter prefix coding"
G- 3/4 gasket seat.
G-.708" Taper seat.
W- .708" (.288" short travel)

Both plugs sit in the cylinder at .708". The only difference is that the AWSF plug has threads only part way up the .708" shaft.
You will not do any dammage using either one of these plugs as they sit in the cylinder at exactly the same length. If you put both plugs beside each other it will be clear to you.


FRANK