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Resurgence of a F100
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[QUOTE="6speedsd, post: 1526080, member: 1242"] So, those Autolite 25 plugs will not work on GT40 heads. These heads require the full thread plug, which is Autolite 104. The half thread 25's won't even begin to thread into the plug hole. The body of the plug hits before the threads grab. Back to the parts store I go! Lol Sent from my SM-G950U using Tapatalk [/QUOTE]
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