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 FeedsPro Mod put on a show at the Southern Nationals. Jason Collins was able to pick up his first NHRA Pro Mod victory at SGMP.
More...
The NHRA's Southern Nationals delivered plenty of great action. Here's a recap of who won a silver Wally at this thrilling event.
More...
Mother Nature tried to ruin Swanfest, but the racers wouldn't let that happen. Here's a recap of all the no time action from The Rock.
More...
Peter Biondo and Dan Fletcher headline the free Smarter Racing Workshop. Attendees gain proven strategies to lower their reaction times.
Do 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.
More...
Recent Technical Articles
Jordan Vandergriff?s Breakout 2026 Season With John Force Racing Fueled By NHRA South
The last 365 days have been a wild ride for Jordan Vandergriff. We sat down with Vandergriff to learn a bit more about him.
NewsSource Today, 04:20 AMMore...