Originally Posted by JohnnyBs98WS6Rag

Or the reason could be that all SSs also have RPO Z28. Or possibly the "G" in the 6th character location in the VIN# (that indicates a V8) automatically triggers Carfax to report "Z28" for Camaros (for both Z28s and SSs) and "Formula" for Firebirds (for both Formulas and T/As). Just sayin'.

Originally Posted by The Bronx Bull

Indeed. I wasn't clear with my first post, but what I was trying to say was that all SS models started as a Z28 in the GM factory, and were only made SS models after-the-fact.

But you are 100% correct, speculatively speaking.