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 FeedsDwight Ausmus earned the Small Tire Pro Stock win at the NDRL race on Sept. 11, 2026 at Darana Raceway in Hebron, Ohio.
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Forget James Bond: This Aston Martin Packs A Twin-Turbo Hemi
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