After 1973, it was decided that the 2.4 litre wasn’t really fast enough for the 911, with the impending American emissions standards threatening to slow the model down to the point that ordinary Cadillacs would smoke its droopy tail. The solution: to take the 2.7-litre engine developed for the Carrera RS, detune it a bit, and make it standard across the board.
This made the 911 a very usable sports car for all driving conditions. It was only natural that capacity for mainstream production should be increased to 2687cc, which gave a good increase in torque to match the 150bhp of the 911 2.7 Coupe. Impact bumpers were now required to satisfy American law and production ran from 1974 to 1977.