Thread: NGK vs. AC Delco spark plugs
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Old 05-14-2008, 05:50 AM
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njsteve njsteve is offline
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Default Re: NGK vs. AC Delco spark plugs
Those NGKs are great. I switched out the hemi and the 455HO to NGKs from Autolites and it was a noticeable difference.

Listen for yourself:

455HO with Autolites:




455HO with NGKs:



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