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8. The last thing you want to do is cross thread spark plugs into the head. A little trick I use; with the spark plug socket and extension, unscrew the spark plug you just put in there. Yes unscrew it, go counterclockwise till you feel the threads “click,” or drop into place. That’s the right spot where the threads meet, and start screwing it in, by hand first, and the spark plug should take the threads easily. If it doesn’t screw in by hand easily, find out why before you damage any threads. You will never cross thread if you do this little back out trick first.
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