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For the '67 model year Z28 was just an option code on the Camaros. It got you a 302 plus some other goodies. Now I think the 'Z' is just a marketing strategy.
In the beretta and cavelier the number following the Z usually meant the what size the engine was (in the early models). It was an option package, and a sporty one.. The Z-series cars were all "race insplired".
Z-28 (and for those of you that remember the Z-16, the 1965 SS396 Chevelle, 201 produced) was an RPO (Regular Production Order) number. GM also used COPOs (Central Office Production Orders) for special cars like the 427 powered Camaros and 1969 Chevelles.
In the beretta and cavelier the number following the Z usually meant the what size the engine was (in the early models). It was an option package, and a sporty one.. The Z-series cars were all "race insplired".
I had thought of that but the early Z-24 cavliers had 3.1 v6's and so did the Z26 beretta.
I hate to admit it, but GM's option codes actually make sense, compared to Ford's. Glass options start with "A," Comfort and Convenience options start with "C," Suspension options start with "F," etc... The letter Z at GM indicates a performance "package," as opposed to individual performance options. I would imagine as the development began on the high-performance Camaro model (intended for Trans-Am racing, right?), the engineers started referring to "that Z-28 out on the test track," and someone in marketing heard it and thought it sounded cool. And the name stuck.