Why does a V engine produce more torque than an inline engine?

Is it because (on a litre bike example) as there are only 2 cylinders (I'm presuming on a twin?), they are much bigger bores so in theory 500cc each cylinder, thus producing more power, whereas the inline 4 engine of the same size only has 250ccs per cylinder?

Or have I got the completely wrong?

Can anybody explain it in laymans terms?