C3 Running Rough 427/400 With K66 - NCRS Discussion Boards

C3 Running Rough 427/400 With K66

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  • Jack C.
    Extremely Frequent Poster
    • September 30, 1992
    • 1090

    C3 Running Rough 427/400 With K66

    I have been using AVGAS for the last year. Bob Kunz rebuilt my carbs and came out perfect car was running great. Filled up with Gulf HT and the car is running like crap and pinging on heavy acceleration. Other than going back to the AVGAS, any suggestions?
    Jack Corso
    1972 Elkhart Green LT-1 Coupe 43,200 miles
    Top Flight 1994, 2018 & 2021
  • Joel F.
    Expired
    • April 30, 2004
    • 659

    #2
    Re: C3 Running Rough 427/400 With K66

    Jack,

    Is the engine otherwise stock? If so, maybe you got a bad batch of gasoline. I would think an L68 should run fine on 93 octane. My L71 runs fine on 93 with 10% ethanol if I do not lug the engine.

    Joel

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    • Jack C.
      Extremely Frequent Poster
      • September 30, 1992
      • 1090

      #3
      Re: C3 Running Rough 427/400 With K66

      Yes, it is all stock. Must be the gas.
      Jack Corso
      1972 Elkhart Green LT-1 Coupe 43,200 miles
      Top Flight 1994, 2018 & 2021

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