Chevrolet introduced the Camaro IROC-Z28 in 1984 for the 1985 model year.
The IROC-Z was option B4Z on the option sheet and could only be ordered with the Z28 package. This new performance icon boasted skid pad numbers within the range of .90 g but wasn’t exactly powerful by today’s standards. The top offering under the hood was the brand new Tuned Port Injection (TPI) 305 cubic inch V8, which first boasted 215 horsepower and 275 ft/lbs of torque, but was later tuned to about 230 hp. From a displacement of 5.7 liters, this doesn’t look like much, but for the economy standards influenced 1980s it was OK.