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 FeedsNicolas 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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ProCharger'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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Recent Technical Articles
Mitutoyo Named Official Precision Measurement Partner of NHRA Through 2029
The NHRA has named Mitutoyo as its official precision measurement partner. The partnership will run through the 2029 season.
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