Originally Posted by subzali
? I always have just tightened the spark plugs until I feel the crush sleeve yield, and then a bit more ?
If they're threaded straight and the socket is straight on the plug then I would think you'd really have to be yarding on the wrench to get the head to strip out...
More than one 3.4 has kaphlewied a spark plug right out of the head. Not sure why. Loose obviously does not help... And cross threading is a lot easier to do than that. Maybe part of the problem is that when the threads start to feel tight you think the spark plug is getting tight, and its not. And the 3.4 plugs are waaaaay down deep in a hole between the cams.