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 FeedsJohn 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.
The Cobra Jet 2200 isn't you're standard EV. This Mustang reset the electric vehicle drag racing record with a 6.78 at 222 mph.
More...
The first IHRA Triple Crown event is shaping up to be huge. Ron Capps and Maddie Gordon will be at the Maple Grove race.
More...
Nitro Funny Car clutch tuning is super complex. In this episode of Tech Inspection we learn about clutch tuning from Tim Fabrisi.
More...
Recent Technical Articles
Servicing Meziere 100 & 300 Series Water Pumps
Keeping up with your race car's maintenance schedule is important. Here's how you can service a Meziere electric water pump.
NewsSource Today, 04:10 AMMore...