power valves tuning

I'll toss some pennies in the pool here too.

Like mentioned, going to a higher or lower number only changes the point in time that the valve opens. If you need more fuel from the PV circuit, then the channel restrictor needs to be altered.

The guidelines from holley and get something that will work. 1/2 of idle vacuum or 1.5" below idle in gear will usually get you an acceptable PV. Call a couple times and you'll get all sorts of advice from the tech line, one different from the other. I have cars that like a PV with a higher reading than either of those way to choose.

The only real definitive way to get the correct PV is to use an A/F meter and run the engine under a mild load with a vacuum sensor/gauge hooked up. You can see when the PV opens because the A/F drops and whether the engine goes very lean before it does.