Do ls motors have vin numbers on them?

[69greyghost]

I have been hearing that people in my area have been getting their cars impounded and their motors are being ripped out because they have stolen ls motors. One if this is true, how can they even tell? To my knowledge I dont know where the vin numbers would be located, and if they are on the motor where? I am just curious because I am sure my motor isnt stolen but just for future reference how can they tell if at all?