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How much horse power does a stock Chevy 89 5.7 have?

The 1989 Chevy 5.7L (350 cubic inch) small-block V8 engine's horsepower varied slightly depending on the specific application (truck, car, etc., and even trim level within those). However, it generally ranged from 170 to 230 horsepower. You'll need to check the specific vehicle's documentation (owner's manual, sticker on the door jamb, etc.) to know the exact horsepower rating for that particular vehicle.