How much horsepower is in a 5.7 tuned port injection engine?

The horsepower of a 5.7L tuned port injection (TPI) engine varies significantly depending on the year, make, and model of the vehicle it's in, as well as any modifications. There's no single answer.

However, a stock 5.7L TPI engine typically produced somewhere in the 230-250 horsepower range. This is a broad estimate, and you'd need to specify the exact vehicle to get a more precise figure from its factory specifications. Modified engines can easily be significantly higher or lower than this range.