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66 327/350

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  • Rich Freeman
    #1

    66 327/350

    What is the correct oem spark plug for my 66 327/350 coupe. Is it AC44 & AC45?
    Thanks
    Rich
    Tags: None
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    • Duke W.
      Beyond Control Poster
      • January 1, 1993
      • 15649
      #2
      Re: 66 327/350

      AC 44 was OE, but the slightly hotter AC 45 will have less tendency to foul in normal drving. These plugs are only available in resistor versions now, so you will be able to find R45s.

      If you want a non-resistor plug that is the same heat range as the AC 45, you can buy the NGK B4 or Denso W14-U.

      Duke
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        • Michael H.
          Expired
          • January 29, 2008
          • 7477
          #3
          Re: 66 327/350

          Rich,

          The correct spark plug recommended by GM for most normal street driving conditions is AC44. AC45 would be recommended if the car rarely sees any highway operation. Always use the coldest plug heat range that will survive with the type of driving that you do.
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