AC Delco spark plugs - The Supercar Registry

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AC Delco spark plugs

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#13

03-14-2008, 04:43 AM

Salvatore Salvatore is offline

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Re: AC Delco spark plugs

R43N is the same heat range as the R43's. The N is for a BB because it takes the longer or extended threads. I believe 3/4". I like the R44S or the R45S for my 69 Z. They run nice and are an original AC Delco plug. S means extended tip. I bet the 44's or 45's would work good in the BB too.

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