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 FeedsGaige Herrera mopped up the field at Sonoma during the Pro Stock Motorcycle All-Star Callout. This is Herrera's second Callout title.
More...
The NHRA Sonoma Nationals put on a show in wine country. We break down who picked up wins in front of a sell out crowd this weekend.
More...
Here's your chance to own a great grassroots drag strip. Middle Georgia Sports Park is for sale and can be yours for three million dollars.
Team Big 3 Racing is ready to take on the $10K Drag Shootout. This team has no problem dealing with tight timelines and budgets.
More...
The Kalitta Motorsports drivers are pushing hard for more magic at Sonoma. Each team is preparing for the Countdown that's coming up soon.
Recent Technical Articles
MWDRS Launches Quarter-Max Pro Extreme Exhibition Class To Evaluate 2027 Championship
Extreme Pro Mods could have a new place to play in the future. The MWDRS will provide an exhibition class for two events in 2026.
NewsSource Today, 08:00 AMMore...