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SPARK PLUGS for 1979, Olds 350

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  • bird 60
    Super-Experienced
    • Mar 18 2009
    • 1144
    #1

    SPARK PLUGS for 1979, Olds 350

    Hi Guys, I'm assuming someone else has a 1979 Cadillac Eldorado with the 350ci Oldsmobile Engine. The recommended Spark Plugs in my Manual are AC R-47 SX. What is the equivalent NGK plug? I've had the Eldo for 2 years now & I thought I'd change plugs. The ones in the car are NGK B6E S., but I don't know if they are the right ones.
    If someone can help it would be gratefully appreciated.

    Thank You.

    Chris.......From OZ.
    Tags: None
    • jopizz
      Super-Experienced


      • Nov 23 2009
      • 8346
      #2
      The AC Delco catalog shows a R46SZ, not an R47SX. I can't even find that plug listed. The NGK equivalent would be a 4536.

      John
      John Pizzi - Squarebirds Administrator

      Thunderbird Registry #36223
      jopizz@squarebirds.org 856-779-9695
      https://www.squarebirds.org/picture_gallery/TechnicalResourceLibrary/trl.htm

        Comment

        • bird 60
          Super-Experienced
          • Mar 18 2009
          • 1144
          #3
          Thanks John. My Cadillac Manual definitely states AC R-47 SX.
          Looks like the AC R-46 SZ has superseded the original from back in '79. No wonder I couldn't cross reference. Everything is A OK
          now. I still can't get over the 60 thou gap.

          Thank you.
          Chris....From OZ.

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