Thanks for that info. I think they're Denso. b/c that's what I think* we pulled out of his LS1. So for him it's a deffinate go. but for my 3.0v6 i'm not sure I can justify buying them ya know... I'd go NGK, not denso. NGK's have a larger tip which last longer. .6mm compare to .4mm if I recall. so for lasting.. the NGK say it's the best of both worlds.

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