When you are "Off Boost", you want the Holley Carb to drive "normally" going down the road.
The "Power Valve Circuit" is appropriately named as its sole purpose is to add fuel to the Main Wells under "Power" modes of the vehicle/engine.
Even if you had a Naturally Aspirated Holley carb,
the info I will provide next, would be of some benefit. The pictures show making the Metering Block PVCR circuit "adjustable".
The only difference between that and a Boosted Power Valve Circuit is you would have more Drillings in the same location of the Metering Block depending on the extra fuel required.
(You need more drillings on a Boosted Carb because the PVCRs are small and for each hole you can only make that PVCR hole so big. Need more fuel, add more PVCR holes and "restrictors" to the carb.)
Tom V.
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"Engineers do stuff for reasons" Tom Vaught
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