Ah, alrighty. With those cars, the difference between a normal Camaro and the Z/28 is the V-8 engine, higher-performance suspension, drivetrain, and etc.
In the last version they had: V6 Z28 - Which had the much talked about 5.7 Liter aluminum pushrod LS1 Z28 SS (Super Sport) which was pretty much the same with "ram air" (many argue there's no such thing as true ram-air, simply cold air intake).I believe there was a couple other slight differences between the Z28 and SS.