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

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Recent Technical Articles
AFCO Big Gun vs. Big Gun X Shocks: What?s The Difference For Drag Racing?
You need the right shock for your racing application. We look at the differences between AFCO's Big Gun and Big Gun X shocks.
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