[97stangerGT]

Changed my plugs on my 97 GT (super easy). Found out that the #1 plug was either cross threaded or stripped prior to me owning the car, hence the heli coil came out with the plug! New ones are Motorcraft Plat. and that stubborn one is a Champion copper plug. Cant find any heli coils that are coarse threaded big enough to match it. Any ideas? Btw will be doing the PI swap as soon as I come across a set of heads

[dick.breakey]

sounds like you need to re thread it. its a pain. but would probably work ok

[Bullitt5339]

Do a search for "Timesert", it's a common problem with 4.6's and 5.4's to rip all the threads out. So they made a special kit to fix it.