Attached Link: http://youtu.be/k_S1INdEmdI

The cleft is there in the model it seems. You  have tris where you don't need them (down the center there), which may clean things up but you should watch this video for help on making your models cleaner:

 

http://youtu.be/k_S1INdEmdI

 

Though you may not be subdividing your model, there are important notes in the video on how to avoid the very thing you're seeing.