By god i would have never believed it but this is the 2nd time i thought there was an exhaust leak or a loud lifter. On my 01 supercrew the plugs way down in the block went through checking ,1 turned not even a quarter turn, no more tick. This is strickly 4 info if u notice that tick especially at a drivethru it bounces off the building bugged me to death. DAVE

Try putting a little locktite on the end of your plug, matbe it will not loosten up again, usually the plugs will loosten if you are using high rpms, or the hole is a little stripped