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 FeedsDo you have what it takes to win the $10K Drag Shootout? Here's your chance to apply and be a part of the ultimate drag racing show.
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Improve Reaction Times At The Smarter Racing Workshop
Peter Biondo and Dan Fletcher headline the free Smarter Racing Workshop. Attendees gain proven strategies to lower their reaction times.
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