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Curb weights rose dramatically in the 1974 model year due to the implementation of 5 mph (8.0 km/h) telescoping bumpers and various other crash and safety related structural enhancements; SD455 Trans Ams weighed in at 3,850 lb (1,750 kg) in their first year of production (1974 model year; actually 1973).
The 1974 models featured a redesigned "shovel-nose" front end and new wide "slotted" taillights. In 1974, Pontiac offered two base engines for the Firebird: a 100 hp (75 kW) 250 cu in (4.1L) inline-6 and a 155 hp (116 kW) 350 cu in (5.7L) V8. Available were 175 to 225 hp (130 to 168 kW) 400 cu in (6.6L) V8 engines, as well as the 455 cu in (7.5L) produced 215 or 250 hp (160 or 186 kW), while the SD-455 produced 290 hp (220 kW). The 400, 455, and SD-455 engines were offered in the Trans Am and Formula models during 1974
Source: Wikipedia (original)