If you look above at the second image, you'll see how the Rochester B came from the factory. The hole to the left and below the power piston is the vacuum passage...and I suspect you'll understand why I was trying anything to increase vacuum transfer with my added tube. There is no screw there to keep that part of the air horn pushed down on to the float bowl and you can appreciate that any bit of warping of the body (which is exacerbated by only having 4 screws holding this all together) will make that all worse. 2 images are attached here. This is what I discovered when I took one of the carburetors apart...2 gaskets had been used. A common trick which can make things worse. And as you can see, one of them had been sucked out of place leaving a special little vacuum leak between those two gaskets and also back into the float bowl. In the second image you can see where the power piston vacuum passage should be sealed. And it might have worked if there hadn't been about .007" space between the 2 gaskets leading back to that area. But additionally, every time this vehicle went around a corner, it was likely to slosh fuel up and into the bore.
~ Jon 1952 1/2 ton with 1959 235 | T5 with 3.07 rear end
