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 NHRA Pro Mod season championship is going to be settled in Las Vegas. Here's preview of who's in the hunt for a world title.
More...
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.
The 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.
More...
Recent Technical Articles
Piedmont Dragway Saved: New Owners Plan To Reopen Iconic NC Track
Historic Piedmont Dragway has been saved and will continue to operated as a race track. Greg Loflin and Terry Ferrell purchased the track.
NewsSource Yesterday, 10:00 AM