The entire 911 line was changed in 1974, with the base 911 having a new 2.7L flat-6. It put out about 150 horsepower. Major changes from 1973 included big, heavy duty bumpers, the engine, and reinforcements in the body, such as the beams within the doors. The models to choose from at this time included the 911, the 911 Carrera, and the 911S. The base 911 was only available in America for 1974; from 1975 to 1977, the least expensive model in North America  was the 911S. The 911 2.7 was available to the rest of the world, though, until 1978 when the 911SC became the only non-turbo 911 produced.
 

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