bobprivett

Thanks for the info. TSB, video etc. are in hand.
Bob

MalibuJerry350

I'll be waiting until the 100,000 mile mark (nearly 50,000 miles on the clock now). If I changed the plugs every 12,000 miles, I'd be doing it every 4 1/2months!Hell, these plugs + fuel injection + unleaded gas should equal very high mileage before a swap is necessary due to a drop in performance.After I swapped a new High Performance 350 into my 70 Chevelle in 1996 with HEI instead of points ignition, I easily ran 70,000 miles on regular AC R44TS plugs. The plug wires would have to be changed before the plugs! Of course, as with the GT, the Chevelle saw mostly high speed highway driving, everyday, since 1970. These cars should do better, what with the better fuel delivery and ignition systems.

Goldenpony

Remember, the plugs "wearing out" is not the question here, it's the plugs seizing in the head. You're 100% right, the engine will probably run great to 100,000 miles, but you will most likely have a tough time getting them (and the broken pieces) out. Your Chevelle never had plugs designed like this. It's apples and oranges. Anti-seize is a beautiful thing.

J2L06GT

I was on another mustang forum and somebody with
an 08 GT pulled the the plugs and they are a new design,
looks like they tapped the head all the way down to
combustion chamber and the plugs are threaded the
full length, might want to wait before buying plugs.

td1320

I just changed all of mine yesterday. I have 43,000 miles on the originals. First I let the car sit overnight then I broke each plug loose and then retightened, then turned them out slowly. The plugs made a vibrating squeak which I feel either helped break the carbon loose or my plugs were not that bad. I had a flutter miss after installing the KB so I went to the HT0's and the car pulls hard all the way through with no miss now. Just my two cents.

ski

Did you use penetrating oil or carb cleaner?

r6allstar

Correct me if I am wrong, but wont the anti-seize burn off from the heat?

Hicompression

You're wrong. The antiseize required per the Ford TSB is "Nickel" antiseize. It will not burn off like copper or aluminum antiseize. Nickel will stand up to high combustion chamber temperature and pressure.

Hicompression

Well, I followed the TSB to a "T". I used the Motorcraft recommended carb cleaner and I let the plugs sit overnight after breaking them free a quarter turn. The results?....after 96,500 original miles and following the TSB...1 plug broke off in the head. I will be commenting in a separate thread on what exactly I did, but here's some pics...

Here's a link to my thread: https://mustangforums.com/m_4844059/tm.htm




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MalibuJerry350

Sorry guys, but you can put ALL the anti seize you want on the threads, but that won't prevent the electrode shield from twisting off and remaining in the head. BUT, at least the plug will be easier to remove....once the shield snaps off. This is a design flaw, plain and simple. As I said, I'll wait until I HAVE to change plugs and THEN deal with it. If the plugs sanp off, I'll pull the heads. No biggie.Rebuilt enough engines,tranny's and cars over the years not to sweat this problem.