[Gaz64]

A few things to look at while changing power valves.

They should be NO fuel moisture AT ALL on the vacuum side of the power valve.

The fuel bowl is sealed from engine vacuum in two ways, one is the diaphragm, one is the valve gasket.

I test every power valve I have prior to fitting for leakage.

There is a tool for this from Moroso, and others maybe.

A quick test as Lippy has said is if the stem can be turned easily the valve is blown. I've seen this with new valves. I don't even attempt to use them if I can turn the stem.

And another thing that has me beat is if a power valve is open at idle it only allows the PVCR fuel area to be added to the MAIN JET area TO THE MAIN WELL.

It should have nothing to do with the how the engine idles, whether you have 60 mains or 98 mains, it makes no difference.

Make sure all fuel jets are snug in the metering blocks, and Power valves are torqued to 100 in/lbs.

Gary