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 FeedsAccording to sources the IHRA has laid off staff for the Outlaw Nitro Series. The series has already amended its 2026 schedule.
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Strange Engineering's Max Extension Strut is deigned for maximum weight transfer. Learn how this strut can help any door car hook better.
The fans have spoken and we now have four teams for the $10K Drag Shootout. Team Food Stamp Fast has been selected as the final team.
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The NHRA is heading back to its roots for the start of the 2027 season. Here's a look at the first four races of the 2027 NHRA season.
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The GETTRX NHRA Pro Stock Motorcycle All-Star Callout will have big money on the line. The top 8 riders will be battling it out for $25,000.
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