I bought these for routine maintenance in my 2004 Dodge 4.7L. These motors really prefer the copper plugs and you should too. Don't believe the hype of the insanely expensive plugs. Other metals last longer than copper, But Generate more heat and less preformance.On to these plugs specifically, Champion seems to be the standard in copper plugs. I never trust pre-gapped plugs, But after checking all of these arrived with an average gap of 0.042. None were out of spec.After a few hundred miles, Running smoothly and no problems. Gas mileage even went up 1 or 2 mpg
Rating: [5 of 5 Stars!]