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are spark plugs all created equal?

2K views 9 replies 8 participants last post by  sick'r bee 
Not at all. Even plugs recommended for various motors from auto zone don't always work as well from one brand to another. 3 hp wouldn't be unheard of at all, but it's mostly about keeping the engine running smoothly for longevity. The 5.7L hemi in the trucks don't like fancy plugs. The stock champion copper cores are the way to go. I don't know if it's true or not for the cars, but I'd be using copper cores unless I learn otherwise between now and my first plug change on here.
 
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