How many horsepower do a 1994 Chevy silverado 350 have?

The horsepower of a 1994 Chevy Silverado 350 depends on the engine it had. The 350 refers to the cubic inch displacement, not a single engine. Several different 350 cubic inch V8 engines were available that year, each with differing horsepower ratings. To know the horsepower, you need to identify the specific engine code (found on a sticker under the hood or on the engine itself). Without that code, I can only give you a range: the horsepower likely fell somewhere between 170 and 230 horsepower.