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 FeedsStreet Car Braggin Rights is the ultimate grassroots racing event. Check out this gallery of action from SCBR at Rockingham Dragway.
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Elite Motorsports rolls into zMax with a positive head of steam. Here are the big Elite storylines heading into the 4-Wide 'Nats.
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Brett LaSala's Coyote combination just got hit hard with rule changes. Here are the changes in the LDR rules for the Coyote combination.
Buddy Hull is ready to take on a new racing challenge. Hull will be stepping behind the wheel of a radial tire Mustang.
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Del Holbrook has made the move to IHRA Bratz racing and has more tricks up his sleeve. His Mustang has been converted to a twin-turbo setup.
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