The only circuits that seem to be in this carburetor are the idle circuit and the main, or high speed circuit.
The book indicates any transition from idle to main that reduces manifold vacuum by 5hg will unseat the power valve and give the engine the needed shot of juice to increase RPM.
I think the accelerator pump is for less subtle throttle changes...as in "put yer foot in it".
My though would be something didn't get cleaned properly when the parts were 'tanked'.
As Brain mentioned, the piston which 'is' the power valve must operate freely. It has a spring, but I think it is quite small.
If you carburetor didn't do this before the rebuild, and it does it now, it would be a safe bet something is rotten in Baghdad.
The base gasket must be oriented properly to expose the little vacuum sensing hole.
If this hole were to be blocked, I think the power valve would be in a constant state of OPEN!
Having said all this, keep in mind I was absent from school when they taught 'Rochester's 101'.
Stuart
