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Plug heat range

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  • Plug heat range

    Anyone know why the 59-64 shop manual lists Jet thrust plugs as J12Y and the Avanti work shop manual says J9Y. Same engine different heat range, which would be correct?

  • #2
    quote:Originally posted by 41 Frank

    Anyone know why the 59-64 shop manual lists Jet thrust plugs as J12Y and the Avanti work shop manual says J9Y. Same engine different heat range, which would be correct?
    My Guess would be J12Y. I don't think you can get the J9Y any more but not sure about that. For what it's worth we run J61 in the Tomato and Wrapper but they are run 90% on the strip so would probably be too cold for the street. I would try the J63Y though and if it proved to be too cold, then use the J12Y. The J12Y will be cheaper than the other two and I think the H-10 or H-11 could also be used if you didn't want the extended tip.

    Ted

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    • #3
      Since I have J12Y's in there now I will probably leave it alone as it is working ok this way. Thanks Ted
      Frank van Doorn
      Omaha, Ne.
      1962 GT Hawk 289 4 speed
      1941 Champion streetrod, R-2 Powered, GM 200-4R trans.
      1952 V-8 232 Commander State "Starliner" hardtop OD

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      • #4
        I have been running NGK XR 5 spark plugs for the past year. The Avanti seems to like them. The heat range I think is perfect for both around town driving and on the strip

        Peter Sant

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        • #5
          I will keep that ngk number in my stuff also Peter, I just wanted to be sure I had the proper ones for street and strip as I intend to invite some of you to indulge in a little grudge racing in Omaha in September.
          Frank van Doorn
          Omaha, Ne.
          1962 GT Hawk 289 4 speed
          1941 Champion streetrod, R-2 Powered, GM 200-4R trans.
          1952 V-8 232 Commander State "Starliner" hardtop OD

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