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My pickup has the 4.6 V8, and at 97,000 (+/- a few) I decided to change the plugs. The plugs that came out were installed at the factory. I was shocked!! The electrode was worn down to the porcellian, the darn gap must have been a 1/4" and the truck was running just fine!! Well I broke down and replaced them, with the same plug (p/n) number and they are still in there at 143,000 (+/- a few), and the truck still runs fine. Only fly in the ointment...shoot changing those rascals was an absolute pain...darn near have to take the tail lights out and work forward taking stuff off just to reach the rear ones... total pain in the butt. Hope this info is of some help, Rotorman
PS.. If anyone out there know the "trick" to changing the rear ones, please let me know... got a programmer, and new intake system coming, and really should change those DARNED plugs again!!
Your taking out the taillights comment reminds me of the old joke about the gynecologist that was training to become a mechanic. He got extra marks for rebuilding an engine through the tailpipe.
I concur with the Motorcraft or the Autolite double platinums. When doing the passenger side unbolt the wiring box thingy from the firewall and pull it out of the way and on the driver's side you will remove the power steering resevoir. No big deal on either one. I have a 5.4 and it took me 4 hrs the first time. Can do it now in two hrs. It is a pain but take your time and you will do fine. Do not be surprised if the new plugs have more threads than the old ones. Mine do. Just as long as the reach from where the plugs seat to the tip of the plug is the same.