Balancing a Scat cast crank

Yes, that is all well known. What I'm trying to explain is that in the case of the B&M flexplate for the 360, the external weight it provides may still not be enough. Ditto for the stock 360 damper external weights. The longer stroke changes everything.

So was there no datasheet showingdata with the crankshaft bobweight? Normally they have data somewhere as to the bobweight at or below which the crank can be internally balanced. I've looked on the SCAT site but no joy....