OK so I just talked to the mechanic at my ford dealer and I think they are still using 2 piece plugs when changing them out.
He also told me that they have never had any break.
So what makes the plugs break for us regular folks is it carbon or a small hole for the plug in the head?
How many miles are on the car? If less than 30,000 than go ahead and pull them without a doubt. Install Autolites and remove them periodically, check gap, and reinstall. I've removed countless plugs from 3Vs including F150s and Mustangs without a broken plug. I've removed plugs from a F150 5.4L 3V which are a little bit more notorious for plugs breaking with more than 60,000 miles on it and they all came out just fine. I didn't even follow the TSB, just pulled them, nothing special. It's fairly easy to change plugs as well. It only takes about an hour taking your sweet time. A lot of people cry "chicken little" but it's not the end of the world. One thing I have noticed with some guys who are breaking the plugs is that they are using the wrong socket. The Autolites are about the most reliable thing when they are removed periodically. The Brisks have been known to burn up quicker than the Autolites, especially in forced induction and nitrous cars.
for stock ignition i use the ngk iridium. for hotter ignition systems i use the bosch fussion plugs.
They make them for the V6 but not the V8 for some reason.
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