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A flat-12 is a type of internal combustion engine. The engine is similar to a V12, but with the cylinders situated 180° apart. The advantages to the design are the large number of cylinders, low center of gravity and lack of disruption of the airflow to the rear wing. Disadvantages include heavy weight, high fuel consumption and reduction of aerodynamic options for the underside of the car.

Ferrari used a flat-12 throughout the 1970s, and Alfa Romeo had one in the latter part of the decade. Both engines were discontinued when turbocharging became necessary.

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