Holley Power Valve Experimentation

RustyRatRod said

I go a bit more than half cruise vacuum. Mine for instance is 14hg at cruise. So I want about 2 under that. But the 10.5 is all that's available. It does make a big difference too. You're right on the money about that.

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In my stroker van on the street at light steady cruise even at highway speeds I can often see, believe it or not, 21hg, but on average about 18-19hg or so. As indicated by a SW panel mounted gauge. My idle vacuum is about 8-9hg in gear and about 11-12hg in park. This all matches a handheld vac gauge I have used before the gauge. If I used half of in park idle that’d be about a 6.5 but in gear a 5.5
The thing would never open until I really got into the throttle. There’d be nothing at all on the primaries under any amount of load until I got into the secondaries heavily. Nothing like feeling the power kick in even more from the PV with various light throttle only on the primaries.
Just like someone experiencing a tight higher stall converter for the first time it changes what you may have believed prior