Give this a read: Spark Plugs 101
It was written by a fellow Tbird owner with a supercharged 4.6L, so the info holds true for most modular Mustang owners also.
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'97 T-bird LX 4.6L 2V, auto
SVO heads/intake, Vortech T-trim, front mounted intercooler, blower cams, Cobra crank, Manley H-beam rods, JE pistons, Aeromotive fuel system w/ 42# injectors, and much more
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