How many horses does 1998 Chevy vortec engine have?

The 1998 Chevy Vortec engine doesn't have horses in the sense of animals. "Horsepower" is a unit of measurement for power, and different Vortec engines from 1998 had different horsepower ratings depending on the specific engine (e.g., 4.3L, 5.0L, 5.7L, etc.). You'd need to specify the exact engine displacement to determine its horsepower rating.