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I don't like power valves on a Race engine.A race engine with high CR & big cams & lots of timing is going to spit back through the carb at times cranking and thats the end of the PV!An its seems like some times they have a mind of their own and can open & close as they please.
Power Valves=Trouble!!!!!

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I dont run a PV but the carbs now days have a back fire
valve to prevent the back fire to blow out the PV

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They may have a valve now to keep the back fire from blowing out the valve,but I bet they still have a mind of their own and can open an close at will. All joking aside I have never been able to get them to work right and work right all the time on any engine,but some times on a street engine you just have to settle for as best/close as you can get things.
PS thats why I am becoming a bigger & bigger fan of FI!