Are the two the same thing? Example:
“Exploding Whale?” I blurted. “You mean someone blew up a whale with dynamite?”
“Exploding Whale?” I blurted out. “You mean someone blew up a whale with dynamite?”
What would be the difference in this case? Maybe none? I checked in the dictionary and there's blurted but not blurted out, however the dictionary example of blurted has and out: "she blurted out the truth".
When I typed blurted out on Google I got this:
to utter suddenly or inadvertently; divulge impulsively or unadvisedly (usually followed by out): He blurted out the hiding place of the spy.
It says usually followed by out. But it doesn't say why or when.