Holley Idle Setting

Hi Guys,

Everything I have read about setting the idle speed on my 650CFM Holley 4160 with electric choke and vacuum secondary says to adjust the primary and secondary idle screws in equal amounts.

There is no visible secondary idle screw but the data refers to one under the carb body. I understand about showing .020" of transition slot primary and secondary initial throttle blade settings. Is it then necessary to remove the carb every time you adjust the idle speed?

Thanks for any help.

Dennis McGillis
1965 Malibu SS-350


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