 The Z28 hood included a rear-pointing raised scoop (air induction) with a solenoid operated flap which opened at full throttle, allowing the engine to breathe cooler air.A federally mandated speedometer also debuted this year, down from 130.Z28s had new optional grey 5-spoke rims (later used on the 1986–1988 Chevrolet Monte Carlo SS), a unique upper and lower front grill and smaller revised graphics on its doors.