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 FeedsElite Motorsports is ready for the NHRA Southern Nationals. Every member of the team wants to make history this weekend at SGMP.
More...
The Southeast Gassers Association is heading back to Bama. The top gasser series will visit Holiday Raceway for the Bama Brawl.
More...
Keeping up with your race car's maintenance schedule is important. Here's how you can service a Meziere electric water pump.
More...
John Force Racing is ready for the Southern Nationals. See what the teams have planed for this inaugural event at SGMP.
More...
Ron Capps enters the NHRA Southern Nationals as points leader. Maddi Gordon is ready to run at SGMP for the first time in her NHRA career.
Recent Technical Articles
Turn & Burn Combines Drag Racing And Festival Vibes Into One Drag-And-Drive Event
A new twist on drag-and-drive is coming to Summit Motorsports Park. Here's what you can expect at the Turn & Burn event.
NewsSource Today, 04:10 AMMore...