Talked to a place in California that rebuilds Mercedes motors. They said that the front pulley should be neutral balance separately, They also said that the crank assembly should be neutral balanced. However, they say that the way mercedes does it (and they do it) is to neutral balance the crank, hub (the thing with the timing marks), and flywheel as a one piece assembly.

So theoretically, if everything is zero balanced, than the assembly as a whole should be zero balanced . . .

They mentioned possible "static" balance issues. I didn't know what this meant so I looked it up: "By static balancing, one means that you insure that the crank shaft is in balance while it is stationary in any position; that is, that the shaft is actually the center of gravity when it is stationary. Put another way, there is no tendency for a static crank shaft to rotate from it own imbalanced weight." from http://answers.yahoo.com/question/index?qid=20090316165052AANKWCL . This is different from dynamic balance - i.e., balance around a central axis when the crank is spinning .

I don't think this will be an issue though since my crank was already neutral balanced and I didn't have to mess with it . . .