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Reply to "Brake booster"

I am not sure what vacuum the dual valve uses at idle, it talks about adjusting it with a gauge and reading 0-1", but this might be the port for setting the valve up and not what the valve will allow at idle. They designed the valve to allow some vacuum at idle and increased flow at cruise.
I did use a GM truck pcv at one time which is just a small hole, not sure it helped.
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