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

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The IHRA announced major changes to its Outlaw Nitro Series schedule. Several races have been removed the schedule due to facility issues.
Jeff Rudolf experienced a horrific crash at the end of the 2025 season at Bradenton. Rudolf has rebuilt his Pro Mod and is back racing.
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The 2026 PDRA season reached its halfway point at MDIR. Here's a recap of all the action from the PDRA North vs South Shootout.
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