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From 85-87 the IROC package was an upgrade to the Z28. This is why the badging still says Z28 and the doors say IROC-Z.
From 88-90 GM had done away with the Z28 option, having IROC being the optional performance upgrade from the RS or sport coupe.
In 91 when they didn't own the IROC name anymore they brought back Z28 as the performance option.
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87 iroc with the usual go fast stuff
heavier than your half ton.
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