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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 configuration and whether it was a TBI (throttle body injection) or TPI (Tuned Port Injection) system.

* TPI (Tuned Port Injection): This was the more common and powerful version. It typically produced around 230 horsepower.

* TBI (Throttle Body Injection): This less common version usually produced around 170-180 horsepower.

Therefore, without knowing the specific fuel injection system, you can't say for certain. But 230 horsepower is a good estimate for most 1989 IROC-Zs with the 305 engine.