stangladesh

just changed my plugs last weekend. the threads are going to be deeper on the motorcraft. the motorcraft that i pulled out were the exact same. the deeper threads supposedly help prevent the blowout. you have to check them after several days. the last plug on the passenger is a p.i.t.a and will more than likely be the one to blow out if it does because of the awkward positioning of the shaft so its hard to tell if it is tight enough. I checked mine after I heard some ticking. checked all but the two under the MAF which I will probably do tonight to insure I havent jinxed my self. the last one on the passenger side was loose. be carefull on tightening the ignition coil pack. I broke the bolt on mine and had to replace it.

masterofthepuppets99

upon closer inspection i noticed that my new plugs have the same depth as the old crappy autolites. the difference is that the motorcrafts have twice as many threads. so i figure that the motorcrafts *should* hold better. my plan is to grease up my screw driver and rub it around on the hole where the plug blew out and pick up any loose shavings although i dont believe there are any. ill keep you guys posted

_Slowbra_

the motorcrafts *should* hold better with the extra threads.....any updates?

@drag5.0mustang.... you live in parrish?

masterofthepuppets99

the ebay company i bought my cop from sent me one for a 4v so i had to ship it back. just waiting

ESABATM

The cylinder heads are the problem not the plugs. Most if not all PI heads have only 4 threads to hold the plug in. If those threads get damaged by over-torquing the cylinder pressure will eventually blow out a plug.

masterofthepuppets99

well i got impatient and bought a shucks autoparts cop for 40 bucks. it runs. im like YES!!! but how many heat cycles should i go through before i retorque my plugs. im thinking run it for a couple days and then retorque. is that correct