Debugging Node.js core script files

Is it possible to step into and view the source of the core Node.js javascript files using WebStorm (the ones that ship embedded in the Node executable)? I seem to be able to single step into the code their, and the stack trace shows me being inside the node core code. But the source isn't displayed, and I haven't found a way to redirect the IDE to tell it to load the source from a place I specify.