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If you're running a power valve in the primaries, open up the PVCRs for the extra fuel at WOT. That is what they are there for.



Yep, thats what I did with mine and it has worked great.



How to tell how big they need to be opened up?

I have the same problem with my carb



This really is wideband territory. But without a wideband, you can ball park it by using the formula in Emmanuel's Holley book. But you won't know how close you are to a good ratio, only that it drives okay or not.

You can just drill the PVCRs, they do not need to be tapped for jets. If you go too big, slender wires can be inserted to bring the flow down.

The Double Pumpers are good carbs for the track, but are calibrated very rich for the street.

Master, again and still