Yup! You made me open up my new holley book and look up the pv setting.......same as the old one PV number below Idle vac.
I would really like some more to chime in on this.
The Demon carb cam with 4.5 from the factory.
And Barry Grant was wrong. I can't explain why people refuse to learn. But it happens. Hell, there are people who think a spark plug is lean if it isn't brown. Or a power valve can affect idle. There is a million things that aren't true that are treated as true. Bob weight is another. It never stops.
But I'm right about PV timing. Mark Whitener has a really good video on YouTube where he PROVES an open PV at idle doesn't do a thing. Yet, people still argue that it does because it's in a book.