Let me respond to the last 2 replies, Hi Randy let me address a couple of your comments, YES the 4.6 4V(pre 03) and 2V have
4 threads BUT some of the 2V's actually only have 3, I've witnessed it personally as well as my Tuner friends that own Stang Speed shops in my area.
And The plug that backed out of my head WASN'T the NGK it was the much praised agsf 22 C's.
I guess I could have been on top of my problem if I had XRay vision to look through my valve cover to see the plug on Cylinder 7 backing out but my car wasn't misfiring til it was too late, one night when I was pulling into my street I heard a Loud popping sound in the motor so I pulled the cover of the top of the head and witnessed the Coil pack blown apart in 50 pieces, the ceramic COMPLETELY gone on the plug and the threads stripped on the Head. I'll state in again Ford knew this was a design flaw hence the 8 threads on the 03-04 Cobras, I invite you to contact the TOP Tuners in the Country and ask if they've had customers bring in Stangs with similar problems like I stated. My friends shop has seen it more times than you could imagine and simply blaming the plug as the cause of this seems strange to me? The extended Tip NGK's are the Iridium series, the TR's electrodes are the same as Auto's and Motorcafts.
tere's only 2 types of plugs you can use Randy? the Fastest Blown Mustangs in the Country use NGK TR6's and THAT'S A FACT!!
For daily drivers and mildly modified Stangs I agree the Autolites and Motorcrafts are Great But when you see the Fuckin Sick 800+ HP YouTube vids of Blown Stangs on the Dyno their using NGK's.
Everyone is entitled to their opinion and I have respect for ALL my Blue Oval Guys, but I just wanted to share the problem I had and wish Everyone luck with their motors, CJ
dude, I am in touch wth the top tuners in the USA, every day, as most are curtomers of mine and there have been issues but alot of the issues are from detonation from either an improper tune, wrong plugs or a poor install, just to list a few...I've never seen a head wth 3 threads, I'd like to sea some proof instead of someones hear-say, got any pics of this
what is the fone # to "your friends" shop, I'd like to talk to them and sea just how many they've incountered
what mods do you have on yours? I'd like to sea the Motorcraft plug that backed outta' your head, got any pics of it
what fastest blown Mustang are you talking about, again, got any proof or pics or is this still just hear-say or what you read in a magazine
the % of blown plugs to the # of 4.6's out there, well your prob talking less than 1% of the cars made and just about everyone I've encountered having this problem, was not just the fault of FoMoCo....
I dont disagree there were issues wth the heads but alot of the problems stem from the tune, to much boost, wrong plugs, improper install and more.....Im not going to argue wth you anymore on this subject as it would be pointless but I would like to sea some proof from you to back-up any of your claims.....