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What is the horsepower of a 1989 GMC sierra 350 big block?

The horsepower of a 1989 GMC Sierra 350 big block varied depending on the specific engine configuration. There wasn't just one. The most common versions ranged from approximately 230 to 255 horsepower. To know the exact horsepower for a *specific* truck, you'd need to check the vehicle's documentation (owner's manual or build sheet) or the engine's identification number.