Like deafboy said, yes, you can. Here's someone who did: http://forums.overclockers.co.uk/showthread.php?t=18285464
I saw another build where he actually fit it under the grill on top of the case with the fans blowing exhaust. You just lose the top drive bay.
Also, you'd do better in terms of surface area if you did a 360 on top and a 200 up front (200x200 mm > 120x240 mm).