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 FeedsPDRA Drag Wars put on a show in Benson. The PDRA season is winding down and this event played a critical role in PDRA title chases.
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John Force's 2024 crash has led to numerous safety improvements for Funny Cars. Tim Fabrisi developed a training rig for first responders.
Lebanon Valley Dragway hosted Wind In The Valley. This new event was designed to bring more heads-up racing to the Northeast region.
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Jack Beckman will be running a legendary John Force paint scheme at the U.S. Nationals. This scheme honors Force's 1996 championship season.
The NHRA has unveiled the 20-race, 2027 Mission Foods Drag Racing Series schedule, featuring a return to the traditional West coast openers.
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SEGA G-Force Nationals Deliver Big Crowd And Wild Racing At Farmington
The Southeast Gassers Association put on a show at Farmington. Check out the event highlights and winners right here.
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