No, the SP-515 are 2-piece, but they aren't supposed to break as easy.Are the new Motorcraft SP-515 sparkplugs a one piece plug, like the campion plug that can be bought
Not true. Look at the photos in post #7. The threads are not exposed in the cylinder, the GND shield is exposed to the cylinder, and carbon builds up on it.the reason that the plugs are hard to get out sometimes is because the bottom threads are exposed in the cylinder and carbon deposits will build around the threads causing the threads to pull from the head during removal. you can use "seafoam" through the intake system and it will break loose the carbon deposits making the plug removal easier.