Re: NGK vs. AC Delco spark plugs
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The pics you posted show two different types of plugs, one is a projected nose, the other is not. If you don't want a projected nose, and can't find a NGK "normal" cross reference, go to a racing plug if you can find the right heat range.
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If you don't want the projected tip, you could go with a YR5 / 7052 (same as UR plug except w/ non-projected tip)...
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