Did you know?
There are idle ports fed from the secondary bowl on most 4150/60.
Instead of a needle valve, the port is sized as a fixed restriction.
Blockage in Holley Baseplate Passage
Exceptions are carbs where the 'snake passage' from the primary idle circuit is connected to the secondary idle port.
racingfuelsystems-Drilling secondary curb idle holes on a 2 corner adjustable carb
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