[nhramnl]

I was told decades ago to remove the power valves on Holley carbs being used for all-out drag racing and simply jet the carb up 3 or 4 jet sizes. The rationale I was given (and it seems to make sense) is that power valves are devices that provide part throttle enrichment (i.e. they open when you depress the accelerator and vacuum drops to their approximate opening point), and drag race engines spend the entire run at WOT.