I just bought a set of Carbs for a 4.2 XKE. Upon inspection I see that the pistons in all three carbs do not fall properly. They go slower than they should and one does not even go down all the way. I do not even have the lower jet installed - so it has nothing to do with the needle and jet alignment.
I understand that each carbs has the suction assembly and piston machined to make a matching pair. I have tried to swap them around and still get the same results.
Can I try to use sand paper to hone them out a little or what? I have added a youtube video demonstrating the action.