You could but you would most likely introduce a problem like a flatspot etc.

Try it an see.

Maybe Mr Weber knows a bit about it?

yeah I thought it might be something like that but since it's all mixing in the same bowl section of the manifold before it branches off couldn't you fine tune the mixture with different emulsion tubes and jets?

Mr Weber says when each throttle plate is the same size and opened the same amount all the air & fuel metering bits should be the same as in DGAS.
When they're different as in DGAV etc, they're different.
Hope this helps.

Must admit I didn't do a thorough search for this just a small one but here's the question.

When selecting jets for the dgv carbies for instance I've always gone with the smaller jet in the primary barrel since it's smaller and assuming it's leaning out the full throttle mixture?. A frind of mine with a weber fed Hilux had quite a large primary jet and pissy sized secondary and he rekoned it was real punchy down low which is what he needs for 4wd'ing but leaning out too much up top preventing him from achiving a "comfortable" highway cruising speed. With the synchronous both barrels are operating at the same time so would this concept be right in using different jets in each barrel to achieve the optimum mixture at a given throttle opening or full throttle for instance? or should the jets be the same in each barrel?