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What was the horsepower rating of a 1978 Trans Am have?

The 1978 Pontiac Trans Am's horsepower rating depended on the engine option chosen. The most common engine was the Pontiac 400 cubic inch V8, but its horsepower varied throughout the year and due to emission regulations. It ranged from approximately 175 to 220 horsepower. There wasn't a single horsepower figure for all 1978 Trans Ams.