[O] Babel eval w/ C-c C-c but not (org-babel-execute-buffer)

[Ken Mankoff]

Hello,

I'm interested in having code blocks that do not eval when I run 
(org-babel-execute-buffer) but do when the cursor is within them and I 
explicitly want to execute them by entering C-c C-c.

I cannot get this behavior playing around with the :eval header argument. Is 
the behavior I described possible?

Thanks,

  -k.