Carb Tuning
As the secondaries begin to crack open but before the air door fully opens, fuel is drawn from the secondary initial discharge port located at the rear of each secondary bore venturi. This prevents a bog or stumble, similar to the way a Holley double-pumper provides an additional accelerator-pump shot to the secondary circuit, but it relies on vacuum signal rather than a pump. Once the air valve is fully open, fuel is metered through the high-speed discharge nozzle located in the booster venturi. View Related Article
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