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 FeedsJason 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.
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