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Message: <blockquote data-quote="Addermk2" data-source="post: 885439" data-attributes="member: 8201">the people who thread spark plugs into the heads, have done so because of a VER VERY incorrect How-To over on AllFordMustangs. I have sent countless messages to the admins and moderators over there.. and they refuse to fix it.Spark plugs are not 5/8"... One option you might want to try is getting hold of a grade 10 5/8-11 bolt, and grinding a couple notches in it. I used a similar method to clean up the threads in my GT-40's when I plugged my thermactor system. Just remember to work the bolt back and fourth, slowly letting it go deeper.</blockquote>