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How much hp can you get out of a 350 Buick engine?

The horsepower you can get out of a 350 Buick engine depends heavily on the modifications. A completely stock, original 350 Buick might produce somewhere in the range of 150-200 hp, depending on the year and specific model.

However, with significant modifications, you can reach significantly higher numbers. Many enthusiasts have pushed these engines well beyond 400 hp, and with serious builds (forced induction, extensive internal work, etc.), 500 hp or more is achievable. There's no real upper limit, as it becomes more a question of budget and the level of modification.