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 FeedsDayco officially enters the NHRA Contingency Program to reward drivers. Top drag racers earn major cash payouts for reaching the finals.
Jon Moore has taken an interesting route to build an 8-second street car. His Crown Vic is not only lifted, it makes 1,800 horsepower.
More...
Intercomp has added another great scale system to its lineup. The SW700 XBT is packed with features that any racer needs in their scales.
"Disco Dean Karns will debut a new-to-him Pro Modified 1969 Chevelle in his signature pink color at this weekend's IHRA season opener.
FuelTech officially sponsors the 2026 Motorsport UK British Drag Racing Championship. This partnership elevates the Pro Modified class.
More...
Recent Technical Articles
AFCO?s Long Travel Strut Helps Mustang Racers Find Traction On Any Surface
Traction is a critical in a no prep or low prep racing environment. AFCO developed its long travel struts for no prep racers with Mustangs.
NewsSource Today, 06:22 AM