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Re: Looking for Spark Plug Help
If the truck isn't misfiring, it's probably not a resistor wire. The resistor wire will limit current at higher RPM and can cause misfiring.
The "S", as you discovered, is the extended tip. The tip is about 1/8" longer. It shouldn't interfere with the piston. It gives a slight advantage in putting the spark further into the fuel-air mixture.
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