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1974 Pontiac Firebird Formula Curb weights rose dramatically in the 1974 model year because of 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 (1,746 kg) in their first year of production (1974 model year; actually 1973).
1974 Pontiac Firebird Formula. Curb weights rose dramatically in the 1974 model year because of 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 (1,746 kg) in their first year of production (1974 model year; actually 1973).
After the 1974 SD455 was dropped the 1975 Firebird's top performance engine was an 'L78' Pontiac 400 cu in (6.6 L). Pontiac still offered the regular 455 (RPO L75) in its full sized cars, and after a negative public reaction for dropping the 455 engine, it was re-introduced mid-year as an available option for the 1975 Pontiac Trans Am.
Pontiac Firebird Formula (1987-1992) Pontiac Firebird Trans Am (1987-1992) Pontiac Grand Prix Coupe (1987-1996) Pontiac Safari (1987-1991) Pontiac Tempest (1987-1991) (Canada Only) Renault Medallion (1987) Shelby Charger (1987) Shelby CSX (1987-1989) Shelby Lancer (1987–1989) Stutz Bearcat II (1987-1995) Subaru Justy (1987-1994)
One holdout to this industry-wide slide was the Super Duty 455 engine of 1973–1974. Available only in the Firebird Formula and Trans Am models, this was rated at 310 hp (230 kW) net initially but after having issues passing EPA emissions tests, the camshaft was changed to the old RA III cam, and with the change, came a 290 hp (220 kW) net rating.
The L98 V8 was optional in January 1987–1992 Chevrolet Camaro and Pontiac Firebird models (rated at 225–245 hp (168–183 kW) and 330–345 lb⋅ft (447–468 N⋅m)) The 1987 versions had 20 hp (15 kW) and 15 lb⋅ft (20 N⋅m) more and a change to hydraulic roller camshaft. Compression was up again in 1990 to 9.5:1 Camaro/Firebird and 10: ...
Starting with the 1974 model year, Rockford would get a new model-year Pontiac Firebird each year throughout the series. The Firebirds used had an identical "copper mist" color with the Esprit's exterior and interior. Although the Firebirds were badged as Esprits, they were actually the higher performance "Formula" model without the twin scoop ...
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