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 FeedsNumerous IHRA-owned facilities are now up for sale. We've got the tracks that have been listed for auction and when the auctions end.
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Pro Modified veteran Chip King topped a record-setting barrage at St. Louis, breaking the 5.50 barrier with a stunning 5.596-second run.
It was a wild year for the Funny Car and Nitro CHAOS series. Here's a recap of how the title chases played out and who scored the wins.
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Weather Can?t Stop Swanfest Money In The Bank At Rockingham Dragway. Here's a recap of who scored wins at this no time party.
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The Midwest Nationals marked an important point in the NHRA Countdown. See who picked up wins in St. Louis this weekend.
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Recent Technical Articles
Nitro Chaos Ups The Ante With $10,000-To-Win ?A? Field In 2027
Nitro Chaos racers will race for bigger payouts in 2027. The series will now pay $10,000 to the A-Field winners at every event.
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