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 FeedsNHRA 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.
ARP has developed a kit that deals with damaged threads on LS engine blocks. ARP's new stud kit uses oversized threads to save blocks.
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Chad Green is ready to grab his third win of the 2026 NHRA season. Chad and his son Hunter both will be racing at The Strip this weekend.
Recent Technical Articles
Angelle Sampey Earns NHRA Top Fuel License With 3.688 Pass for AB Motorsports
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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