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Discussion in '1970 - 1973 Specific' started by Juan Nicholls, Mar 28, 2019.
What holley carburetor can replace the holley 4555 today?
I would look at the 3310 series 750 holley or the replacement 4555 carbs.
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.
I really liked the 4779 Holley double pumper I had on mine. Much better response than the vacuum secondary carb.
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?
780 is over carbureted. I always had gray tailpipes with the 750!but not with the 780.
Sounds like it wasn't jetted properly for the location. Airflow should not be the color driver here.