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 FeedsThe WCF is almost here and this year is going to be huge. See what makes this event so special and why racers bring their A-game each year.
Larry Wright took this 1966 Satellite from a basket case to a total stunner. This Plymouth is rocking some serious big-block Mopar power.
Aaron Stanfield is well on his way to becoming a Top Fuel racer, Stanfield earned his Top Fuel license in Leah Pruett's dragster.
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If you need a quick release hub with a horn this is for you. Here's how to install IDIDIT's Push-To-Connect Quick Release Steering Wheel Hub.
It was a record-breaking weekend for Pro Stock. Dallas Glenn reset the national record and led the quickest Pro Stock field ever.
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Recent Technical Articles
How An Oil Priming System Extends The Life Of Your Race Engine
Engine start up wear is a real thing. An oil priming system fights wear by lubricating all of the engine's critical parts before it fires up.
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