For 1985 Chevrolet paid the International Race of Champions series to put the “IROC-Z” name on a new top-tier Z28 option — a rare case of a production car borrowing its name from the very race series its predecessors had defined since 1975. The IROC-Z became the billboard for Tuned Port Injection, the L98 version of which came straight from the Corvette.
The powertrain and identification notes below preserve configuration and model-year boundaries rather than treating every 1985 Camaro alike. Ratings use the measurement convention of their period, and visual cues are only a starting point: the VIN, factory labels, drivetrain identifiers, and surviving documentation should agree.