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 FeedsThe Mid-West Drag Racing series pulled off the Tulsa Triple this weekend. Three days, three races, here's a recap of the action.
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No Mercy 17 put on a great show at SGMP. See what racers picked up a No Mercy win and also earned a RORS championship.
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Jason Line reset the national record for Super Stock Hemi cars on his way to a dominating $15,000 win at the Hemi Throwdown at Rockingham.
MCACN will feature true drag racing legends this year. Beswick, Martin, McCandless, Leal, and Rossi will all speak at the event.
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The NHRA FallNationals has become one of the biggest stops on the national tour. Check out our huge gallery from this epic event.
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Recent Technical Articles
Boost In A Bottle: Why Joel Grannas Switched His 2JZ Mustang To CAS
Joel Grannas has ditched turbos in favor of Compressed Air Supercharging. His Mustang will now be bottle-fed and making big horsepower.
NewsSource Yesterday, 12:50 PMMore...