Originally Posted by OldCoot
Never seen any spark plug that wasn't one pc other than the screw on terminal on top.
The 5.4L triton motors used a 2 piece plug they are about twice as long as a normal plug. They were very well known for the bottom breaking off in the head and even falling into the cylinder! Ford even made a special tool just to get the bottom piece out in case it broke off. I was fortunate in the fact that I never had a single one break off on me, (and still haven't), but I wasn't willing to risk it any longer so I searched and searched until I found the E3 one piece plugs to replace them with.
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