Autolite website says go with the 3923 on the V6 and 5224 on the 4.7 V8. Do most all of you use the 3923 on everything?

 

i just changed mine about a month ago or so and went with the 5224 autolites copper. truck runs better than before and can't comment on the 3923's because i went with 5224. these guys know their crap, they have helped me a ton! i am happy with the 5224's though and will probably try 3923's next time.
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A lot of us are running the 3923s...and wow, do they make a difference. None of the literature recommends them for the 4.7, but they work great.