Idle Vaccuum

huskerMember

I have a Holley 4150 double pumper. I have around 10" vacuum at idle. All the idle adjustment screws are 1 1/2 turns out. My vacuum gauge is hooked up to the manifold vacuum port (small port under the front fuel bowl). I expected to see vacuum change when I adjusted one of the idle adjustment screws but I didn't see any change (even with a full 1/2 turn). Is this due to the low idle vacuum?

11/11/151:18 PM

Original Post

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