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Did Chevrolet make a 1986 Z28 that an iroc-z?

No, Chevrolet did not make a 1986 Z28 that was also an IROC-Z. The IROC-Z was a *special edition* package of the Camaro Z28. So, all IROC-Zs were Z28s, but not all Z28s were IROC-Zs.