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

Mustang FeedsThe Kalitta Motorsports team is rolling into the Countdown expecting big things. The first steps towards NHRA titles begins this weekend.
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Recent Technical Articles
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Elite Motorsports begins the NHRA Countdown at the Great Lakes Nationals. The team has several contenders ready to chase a title.
NewsSource Yesterday, 07:14 PMMore...