difference between a big block and small block

so i was watching pass time today and a guy had a ford 460 small block and in my boat i have a 460 big block and i dont know the difference is

 

The term "block" refers to the exterior size of the engine block, not the internal displacement.

A big block is physically larger than a small block. The terms don't necessarily have anything to do with the displacement of the engine.

Big blocks generally have greater displacements than small blocks but that's not always the case.

 

Here, some interesting reading
http://www.hotrodders.com/forum/big-block-small-block-help-please-60833.html

Google it
http://www.google.com/search?hl=en&source=hp&q=small+block+vs+big+block&aq=f&oq=&aqi=g2g-m2