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GMC V6 and V12 Engines Engine repair and rebuilding

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  #1  
Old September 10th, 2023, 08:12 PM
atomman atomman is offline
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Default 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?
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Old September 10th, 2023, 10:19 PM
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LEWISMATKIN LEWISMATKIN is offline
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Default 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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