1971 360 question

RustyRatRod said

I'll go along with that. I think most scoff at Holley acting like there's only one way to skin a cat. Although what you say makes sense and I agree 100%, nowhere at any time have I seen anything in print from Holley that backs up the idle vacuum method as being a "starting point", though it does make perfect sense. There's many ways to skin this dog. I like cats, so.......

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They should definitely say something along the lines that they’re making a basic recommendation for the average user, not an “end all be all” declaration that all PV’s must be half the idle vacuum.

But they’re a big company. Lots of people that buy their carbs open the box and install the carb and if they get as far as changing the jets up or down a size or two they’re doing good.

To me, any of those basic manufacturer recommendations are a starting point for your tune, nothing more. Your car idles at 20 inHG? Well that off the shelf 6.5 PV your carb came with may not be right. Your car idles at 10 inHG? Again, probably gonna have to look at that PV. That’s all it is.

It’s not “wrong”, but it won’t be right for every application either. Just like some of the advice here isn’t right for every application.