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 FeedsSanta Pod?s 60th anniversary kicks off with two massive race weekends. Drivers from 18 countries bring 11,000 horsepower to the drag strip.
Blake Alexander returns to NHRA Funny Car action this weekend. Chad Green is ready to get back to the winner's circle at Joliet.
More...
Matt Hagan and Leah Pruett are ready for Route 66 Raceway. The TSR team is locked in for a big weekend at the Route 66 NHRA 'Nats
More...
If you're going to push a Gen III HEMI to its limits you need a strong engine block. Here's a look at Callies' Hellephant HEMI block.
More...
Racing season rolls on and ProCharger racers have accumulated more wins. Here are the ProCharger racers who won big in April.
More...
Recent Technical Articles
Shawn Ellington Takes Pro Mod Victory At The MWDRS Season Opener
The historic tenth season of the MWDRS started with a bang in Tulsa. Shawn Ellington claimed the Pro Mod victory over rookie Ryan Martin.
NewsSource Today, 08:30 AM