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Yep because you can't run an MSD ignition system on a 4.7 engine it just ain't possible. Also, I started off with just Champion Copper but ended up having to open the gap more than I was comfortable with to get it at peak performance so that's another reason I upped to Iridium.
So far I have 18,000 miles on the plugs and I pulled one to check it out and it looks as new as when I pulled them out of the box. Champion just makes a great product all around.