Autolite 3923's and 5224's
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w/o looking anything up, i was thinking the 3923/3924 was the standard, inexpensive plug with copper core, and the 5523/5524 was had a platinum covered electrode for supposedly longer life.
either will work fine in your truck.
the cooler (shorter) 3923 are supposed to resist pinging a little better when you have a leaking plenum.
either will work fine in your truck.
the cooler (shorter) 3923 are supposed to resist pinging a little better when you have a leaking plenum.
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