Don't try this at home.
The manufacturers specs for the Fairchild F-227 specify a maximum fuel imbalance of 500 lbs. A friend hit a flock of snow geese one night on approach to KSYR. The left prop threw one through the top of the left outboard fuel tank, and he lost all the contents, like pronto. They landed with about a 1500 lb. imbalance - i.e. 1000 lb. over max allowable. They needed full aileron and some asymmetric thrust to maintain control, but the airplane flew.