How much horsepower does an 89 Camaro iroc-z with a 305 HAVE?

The horsepower of a 1989 Camaro IROC-Z with a 305 cubic inch engine varied slightly depending on the specific options and whether it was a TBI (Throttle Body Injection) or TPI (Tuned Port Injection) system.

* TPI (Tuned Port Injection): These typically produced around 225-230 horsepower.

* TBI (Throttle Body Injection): These generally had around 170-180 horsepower.

So, there's no single answer without knowing the specific fuel injection system of that particular car. You'd need to check the original paperwork or the vehicle's specifications to be certain.