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Old 05-24-2010, 10:33 AM
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There are three screws on the 1405 that affect idle... the two idle mixture screws and the idle air flow screw that opens the throttle plates slightly to gain additional airflow when needed on some engines. If the air flow screw is used in setting the idle, you may expose enough of the transfer slots to activate flow through the primary circuits. In that case, changing the jets and/or rods may affect idle quality. Otherwise, it shouldn't. At least, that's the way I understand it. I'm running two 1405s on my 6-71-huffed SBC.
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