Is my chevy a big block or small block?

[Travis V]

It's a small block, big blocks are 400 ci or bigger

 

[Toby K]

How do I tell? Whats the difference?
I have a v8 5.7L (350) C10 1/2 ton pickup

 

[Timothy Dalton]

It's a small block. There was never a 350 big block.