6066 (1960-1966) GMC Truck Club

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-   -   V 12 original spark plugs (https://6066gmcclub.com/showthread.php?t=51638)

atomman September 10th, 2023 08:12 PM

V 12 original spark plugs
 
What were the original spark plugs used in the GMC 702? I am currently using Autolite 403 plugs. Are there Champion or Delco plugs? Is there a better recommended plug?
atomman
Dan Marx

LEWISMATKIN September 10th, 2023 10:19 PM

Re: V 12 original spark plugs
 
that depends on the heads you have on the 702. early production engines used an AC C42s, later engines used the C-44NS. this also covers replacement heads because all replacement heads until 1972 used the "N" series AC plug.


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