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 FeedsHOT ROD Power Fest is back. EchoPark Speedway will be packed with hot rods, race cars, plus there will be a massive cruise.
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Drag racing is a sport filled with sound, but what if you can't hear? There's a huge section of fans that are deaf and could enjoy the sport.
Small Tire Pro Stock racer David Theisen had his heart set on earning an NHRA Speed For All Wally in Indy, and he worked hard to pull it off.
Summit Motorsports Park is ready to host the IHRA World Finals. Bracket racers will now have a place to race thanks to Bill Bader.
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The PDRA hit Bristol Dragway for the Thunder Valley Throwdown. Here's a recap that covers all the action from Thunder Valley.
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Recent Technical Articles
Sick Michigan Miles Set To Bring 250 Of America?s Quickest Street Cars Across Michiga
One of the biggest drag-and-drive events in the country is back. Check out what's going on at Sick Michigan Miles.
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