ok im looking into buying another camaro, the guy claims its a zz4 crate motor, ive yet to inspect the car other then by pics, how can i tell whether the car actually has a zz4 swap i can tell whether it has aluminum heads but that doesnt tell much, what type of engine casting should it have and where if its trully a zz4 motor, other thing is the current owner is not the perosn who did the swap so no paperwork to back up the swap, any help is aprecciated thanks in advance