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 FeedsShane Gray is making his return to NHRA racing in 2027. Gray will pilot a Pro Mod for Elite Motorsports next season.
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Doug Herbert is chasing 500 mph at Bonneville. Herbert will be driving the 5,000 HP "THE BEAST NextGen" on the salt in 2027.
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The Heads Up Hustle puts a new twist on the drag-and-drive race format. Racers get to experience heads up racing after two days of driving.
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The IHRA?s latest shakeup includes firings, sale talks, and more uncertainty over the organization?s future.
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