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1st Gen - Z28 was originally designed as a race-oriented package, with a high-winding V8 sized for Trans Am regulations and the best handling available. SS was the model with the most horsepower and more mainstream than the Z28, which was originally marketed only to road racers.
After that there have been times where the only V8 was the Z28 option, then there was the IROC edition...
Finally, the 4th gen reintroduced the SS model later in its run. The SS was a Z28 with a few additions.
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