I can't definitively answer your question until next month when I put a Sandy Bridge in that case, but it sure looks like it might.
However, I wouldn't use a self-contained liquid cooler in that case. I'd use a big air cooler.
Corsair recommends cool air be brought *into* the case through the radiator to cool the cpu. That won't work well in the Fortress since you already have a positive pressure case (3x180mm bottom fans) and 1x120mm exhaust you shouldn't replace/reverse.
So if you use exhaust, the Corsair won't perform as well as it could and therefore would be bested more easily by large air coolers.