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 has named Dustin Farthing as its new president. Farthing has an extensive background in the motorsports industry.
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The Idle Air Control value is an important setting in an EFI system. Here's how to set the IAC for a Holley EFI system.
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Big money was on the line at Byron Dragway. Here are the winners that brought home the cash from the Autoland Door Car Challenge.
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The first IHRA Triple Crown race took a hit from Mother Nature. The Maple Grove event has been postponed due to heavy rain.
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Shayne Johnson's 1970 Nova is a work of art. This 2,700 horsepower race car just happens to have the looks of a show car.
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Recent Technical Articles
The ?OldsMopar?: Brian Bednar?s Supercharged Gen III HEMI-Powered 1987 Oldsmobile Cut
Brian Bednar's Oldsmobile Cutlass has transformed from family car to race car. Now the Olds is powered by a supercharged Gen III HEMI.
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