I'll bet the flush out has done exactly what you wanted it to - clean out some/most of that bars leaks garbage. In the process it has exposed the reason why it was used in the first place. Hope it is only a crap head gasket. This is the reason why i would never recommend using a band aid fix for a major issue, and it's also a scumbag act to use it just to palm off a 'bad' engine to someone else.