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 FeedsProCharger's new monster F-4X-140-2 ProMod supercharger not only makes record-setting power, but already has a championship under its belt.
Quality scales are important when you're setting up a race car. Check out all the features Intercomp's SW2K Classic Weigh Scales offer.
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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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Boosted 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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Recent Technical Articles
Nicolas Feliciano?s Turbo C7 Corvette Resets The LS Record With A 3.725
Nicolas reset the LS elapsed time record at No Mercy. We take a look at the engine package and car that went 3.725 in the 1/8th mile.
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