Well I came up with the The number of turns head thread Test.
Basically there is a seat in the head for the wider portion of the plugs just above the threads to stop on. This seat, notch, ledge, whatever... read more

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Big money was on the line at Byron Dragway. Here are the winners that brought home the cash from the Autoland Door Car Challenge.
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Recent Technical Articles
Tony Stewart Says Leah Pruett Is the ?Kevin Harvick? of Drag Racing
Tony Stewart's comparison between Kevin Harvick and Leah Pruett is a big compliment. Pruett's ability to do more than drive is underrated.
NewsSource Today, 04:13 AM