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 FeedsChris King is making his return to NHRA racing at the U.S. Nationals. King has made improvements to his program and is ready to race.
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The ProCharger F-4X-140-1 was designed to dominate in Pro Mod. We take a deep look into this supercharger and what makes it work.
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Julie Nataas is ready to make her nitro Funny Car Return. Nataas will drive for Del Worsham at the U.S. Nationals after six months off.
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Street Car Braggin' Rights promoter Nate Prater remains in the hospital. Prater is fighting complications from a previous health issue.
The Southeast Gassers Association put on a show at Farmington. Check out the event highlights and winners right here.
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Recent Technical Articles
Team Kalitta Takes Multiple Championship Battles To The NHRA U.S. Nationals
The U.S. Nationals could be a big weekend for the Kalitta Motorsports camp. All three teams are in position to win a regular season title.
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