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 FeedsJohn Force Racing's drivers are ready to chase titles at Rockingham. The team is riding a wave of positive momentum after the Martin event.
Matt Hagan takes the Funny Car points lead into Rockingham. Leah Pruett looks to rebound in the Top Fuel championship at Rockingham.
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Ron Capps and Maddi Gordon head to Rockingham Dragway ready to win. The duo struggled at Martin, Michigan, and are ready to win.
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Elite Motorsports brought home a win in the Countdown opener. Now the team is ready to grab another victory at Rockingham.
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The 2026 NHRA Countdown to the Championship kicked off with a wild start. We analyze the results of the first Countdown race.
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