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You probably want to go to Shno's House of Z and commizerate with all of the others that have asked exactly your question only to be told, "there is no Z28 announced at this time. And, "GM does not comment on future programs"
So as of today there is no Z28, hence no specs, timing or even acknowledgement.
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"Speed, it seems to me, provides the one genuinely modern pleasure." - Aldous Huxley
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