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 FeedsBoosted engines have different needs when it comes to piston design. We take a look at what features a boosted piston should have.
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Angelle Sampey is ready for her NHRA Top Fuel debut. The three-time NHRA world champion finished her licensing in Las Vegas.
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NHRA Funny Car history was made at Las Vegas. For the first time ever the entire field of Funny Cars cracked the three-second barrier.
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Once again the NHRA Pro Mod championship came down to the final round in Vegas. Justin Bond beat Mike Stavrinos to win the title.
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The Las Vegas Nationals turned up the heat on the chase for NHRA world championships. Here's a recap of all the final round action from Vegas.
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If you love fuel altereds you'll want to check out this episode of the Dragzine Podcast. We talk fuel altered racing with Ryan Hill.
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