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 FeedsElite Motorsports is making a big chassis change before the Countdown. The team will be moving to Jerry Haas Race Cars moving forward.
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Drag Illustrated's World Series Of Pro Mod is moving again. The event will relocate from Bradenton Motorsports Park to the Texas Motorplex.
Jimmy Taylor is our guest on this episode of The Dragzine Podcast. Taylor talks about setting records, his racing history, and future plans.
IHRA owner Darryl Cuttell has broken his silence on the sanctioning body's issues. Alleged non-payment from Elon Musk is covered.
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One of the toughest jobs in drag racing is being a nitro crew chief. Chris Cunningham provides some insight as to what its like.
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Recent Technical Articles
Tom Hoffman Ready to Bump Into the Beams At Summernationals In Indy
Tom Hoffman turns heads in his Mustang, and he is going to get even more looks as he hired Mike Szalay to give it a slick new paint job.
NewsSource Today, 05:10 AM