2-barrel single exhaust producing , 400 cubic inch 4-barrel single exhaust producing , 400 cubic inch 4-barrel dual exhaust producing , and 455 cubic inch 4-barrel dual exhaust producing . Sales were down more than 50 percent due to the 1973 oil crisis, and while the recession continued, prices increased for all 1974 model cars. Only 17,083 Grand Ams were built. 1975 The 1975 Grand Am looked the same as the 1974 model, but had vertical front grille bars, a body-colored rear bumper, and a catalytic converter single-exhaust, which mandated the use of unleaded fuel, along with GM's High Energy Ignition and other items promoted as part of Pontiac's maximum mileage system. In addition to the standard roofline with louvered rear side windows, Grand Am coupes with the optional vinyl roof could be ordered with a full triangular rear side window or a vertical opera window similar to that found on the Grand Prix. Inside, the Strato bucket seats received revised vertical trim patterns, the adjustable lumbar support controls were dropped, and only the passenger seat had a recliner, a "safety practice" which would continue at GM for a decade. New this year as a no-cost option was a 60/40 bench seat with a center armrest. Engines were also detuned to meet the 1975 emission regulations with the compression ratio dropping to a new low of 7.6 to 1 on some engines. Standard was the V8 with two-barrel carburetor, optional were a 400, or a - both with four-barrel carburetors. Turbo Hydra-matic was standard equipment and the only transmission offered this year. Performance from 0-60 was 7.7 seconds. A total of 10,679 Grand Ams were built in 1975 and the series was dropped after this year due to declining sales and rising gas prices as a result of the 1973 oil crisis. Another factor leading to the Grand Am's cancellation were plans for all 1976 Pontiac A-body cars receiving the newly approved rectangular headlights, which would necessitate a complete redesign of the Grand Am's Endura nose and Pontiac officials decided that the expense of such a redesign could not be justified based on low production numbers. The basic GM A-body design remained until 1977. Production Engines 1973–1975 V8 with 2-barrel carburetor (standard engine, others were optional) 1973–1975 V8 with 4-barrel carburetor 1973–1974 V8 with 4-barrel carburetor, 4-speed (not available in California) 1973–1975 V8 with 4-barrel carburetor Notes: A SD-455 equipped