the question is where do i find the LBZ engine code in the vehicle. me and my dad are looking at getting a used 04-06 chevy/gmc crew cab LWB dually. and we want the LBZ engine package since its the 360HP version. i just dont know where to look in the truckto find the code for the lbz engine package. i want to know there not just telling me its the lbz i want to make sure. i dont trust salesmen... thanks in advance.