1970 Z28 carburetor replacement

Discussion in '1970 - 1973 Specific' started by Juan Nicholls, Mar 28, 2019.

  1. Juan Nicholls

    Juan Nicholls New Member

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    What holley carburetor can replace the holley 4555 today?
     
  2. ronzz572

    ronzz572 Veteran Member Lifetime Gold Member

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    I would look at the 3310 series 750 holley or the replacement 4555 carbs.
     
  3. COPO

    COPO Veteran Member Lifetime Gold Member

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    The 750 with vac sec Holley burns better than the stock 780. I know cause I have both carbs and have run them on my 70 Z28.
     
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  4. 70lt1z28

    70lt1z28 Veteran Member Gold Member

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    I really liked the 4779 Holley double pumper I had on mine. Much better response than the vacuum secondary carb.
     
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  5. FlaJunkie

    FlaJunkie Veteran Member Lifetime Gold Member

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    Really? I always liked the way the 780 ran. It was easy to overhaul and setup. And it had vac secondary.

    Why did you think the 750 is better?
     
  6. COPO

    COPO Veteran Member Lifetime Gold Member

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    780 is over carbureted. I always had gray tailpipes with the 750!but not with the 780.
     
  7. FlaJunkie

    FlaJunkie Veteran Member Lifetime Gold Member

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    Sounds like it wasn't jetted properly for the location. Airflow should not be the color driver here.
     

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