Just be aware that the "Power Valve" of the Weber carbs is what you see at the bottom of the float bowl. That is a valve that allows passage of fuel downward when the vacuum signal is lost (acceleration, full throttle), then horizontally toward the emulsion tubes. It is in this passage (horizontal) where the actual fixed high speed jet is put. It is only accessable by removing the lead soft plug in the front of the carb...that is when you will see it. It is about half way down the passage. the jet is what meters the amount of fuel.

Increasing the size of the valve will not increase the amount of fuel entering the power jet.

Thought I'd pass that on.

Good racing.

Bill