Looks like about 22 inches of vacuum. Someone else may have another opinion, but I'd leave it alone. Don't create a problem where you don't have one.
Possible to have too much vaccum?
Trying to learn about carbs so bought an vacuum gauge to adjust the idle mixture ratio. Here is what I am getting at idle. Any ideas or is this reading ok? Gauge is from Harbor Freight so maybe it is bad?
Setup:
Engine fully warm, idle set to 800-850 rpm. Gauge hooked to small port underneath in front of carb. Engine (from what I am told) is a ZZ4 shortblock with Edelbrock RPM heads, intake, and assume the matching cam. Carb is Holley Street Avenger 670. Mixture screws are 1 full turn out.
Engine runs good and doesn't seem like there are any issues. Just checking things out, learning, and tinkering with it.
![Motor vehicle Watch Gauge Speedometer Measuring instrument]()
Setup:
Engine fully warm, idle set to 800-850 rpm. Gauge hooked to small port underneath in front of carb. Engine (from what I am told) is a ZZ4 shortblock with Edelbrock RPM heads, intake, and assume the matching cam. Carb is Holley Street Avenger 670. Mixture screws are 1 full turn out.
Engine runs good and doesn't seem like there are any issues. Just checking things out, learning, and tinkering with it.
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