For 1985, Chevrolet introduced a new Camaro model — the famous IROC-Z, named after the popular competition International Race of Champions. Offered as an option package on the Z28, the Camaro IROC-Z featured an upgraded suspension, lowered ride height, specially valved Delco – Bilstein shocks, larger diameter sway bars, a steering/frame brace known as the “wonder bar”, a special decal package, and an optional Tuned Port Injection system taken from the Corvette. It also shared the Corvette’sGoodyear “Gatorback” unidirectional tires in a 245/50/VR16 size vs. the Corvette’s 255/50/VR16 size, and received unique new aluminum 5-spoke 16 by 8 inch wheels. The new wheels were designed with different offsets front and rear, resulting in the words “Front” or “Rear” cast into the face of the wheels to distinguish which wheel went where.
The Camaro IROC-Z was on Car and Driver magazine’s Ten Best list for 1985.