There should be a breather opposite the PCV - regardless of the side it's on. But - what you're hearing is not crankcase pressure as one might think (bad stuff). It's escaping pressure from a cylinder that was sealed when you shut it down. No big deal.

Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.