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 FeedsThe IHRA?s latest shakeup includes firings, sale talks, and more uncertainty over the organization?s future.
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Team Kalitta dominated the nitro ranks thanks to J.R. Todd and Doug Kalitta's wins. Greg Anderson scored a Pro Stock victory in Seattle.
Bill Bader has pledged a championship opportunity for sportsman racers if the embattled IHRA is unable to deliver on its season.
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FuelTech has been working hard to make drag racing better around the globe. Here's what the company has done at Velopark in Brazil.
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Seattle is the next stop for Tony Stewart Racing. Leah Pruett And Matt Hagan are ready to finish the West Coast swing strong.
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Recent Technical Articles
Inside A Nitro Clutch Rebuild: How Chad Green Motorsports Turns Around A Centrifugal
It's no small task getting a nitro clutch ready for a pass. Chad Green Motorsports shows us what goes into getting a nitro clutch rebuilt.
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