Thread: NGK vs. AC Delco spark plugs
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Old 04-09-2008, 03:18 AM
Salvatore Salvatore is offline
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Default Re: NGK vs. AC Delco spark plugs
I run R44S in my 69 Z and have no problems. You will know if they hit. The electrode will be closed. Is there an NGK chart I can use to cross reference AC Delco plugs to? Thanks, Sam
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