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What carburetor is on 1977 Trans Am 400?

The 1977 Pontiac Trans Am with the 400 cubic inch engine used a Rochester Quadrajet carburetor. However, there were variations within the Quadrajet family depending on the specific engine's output and options. To know the exact carburetor model number, you'd need to look at the carburetor itself (usually stamped with identifying numbers) or consult the vehicle's original build sheet.