* 1967-1969 Camaro Z/28: These typically had around 290 horsepower. However, there's some variation depending on specifics of the build.
* Later generations (e.g., 1990s, 2000s, 2010s): There were no Z28 models in these decades. The Z28 nameplate was revived later. The newer generations (2014-2015) used a different engine with different horsepower ratings.
To get the precise horsepower for a specific Camaro Z28, you need to specify the year of the car.