The 79-81 ZXs have chrome on the bumpers and piller finishers( the ones behind the windows) The hood vents on the 79-81 N/A are closed as opposed to the Turbo type that came on the 82-83 N/As. The 82-83 bumpers are body color and black while the piller finishers are black. And Most 82-83s have T-Tops.
Maybe some other things I have forgotten? Help me guys.
I have an 83 ZXT that has anolog instruments. The digital dash was an option. The best way to tell is from the VIN or the plate inside the drivers door jam. British Victoria has a section in the front of their catolog that gives S/N info for all Z cars.
The first thing I noticed is tail lights.There are horzinal stripes on the 82-83s.The clear back up lights run up and down not side ways like on the older cars.
Here is my check list to tell the difference.
(If the cars are stock)
if its a 79 it will have a 140mph. speedo
if its a 80 it will look the same but only have a 85mph.
if its a 81 it will look the same but have open hood scope on the drivers side.
if its a 82 it will have the body color bumpers.
if its a 83 it might have a digital dash.