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The Firebird Esprit and the Firebird Formula came standard with the 255 hp (190 kW), 350 cu in (5.7 L). The Esprit could be upgraded to a two-barrel carbureted 400 cu in (6.6 L), 265 hp (198 kW), while the Formula could be optioned to receive the L78 4 barrel 400 that produced 330 hp (246 kW) or the L74 Ram Air III 400 345 hp (257 kW).
The Firebird Esprit and the Firebird Formula came standard with the 255 hp (190 kW) 350 cu in (5.7 L). The Esprit could be upgraded to a two barrel carbureted 400 cu in (6.6 L)265 hp (198 kW), while the Formula could be optioned to receive the L78 4 barrel 400 that produced 330 hp (250 kW) or the L74 Ram Air III 400 345 hp (257 kW).
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.
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: ...
When introduced in the 1997 Corvette, the LS1 was rated at 345 hp (257 kW) at 5,600 rpm and 350 lb⋅ft (475 N⋅m) at 4,400 rpm. After improvements to the intake and exhaust manifolds in 2001, the rating improved to 350 hp (261 kW) and 365 lb⋅ft (495 N⋅m) (375 lb⋅ft (508 N⋅m) for manual-transmission Corvettes.
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.
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)
Also called the GM small corporate pattern and the S10 pattern. This pattern has a distinctive odd-sided hexagonal shape. Rear wheel drive applications have the starter mounted on the right side of the block (when viewed from the flywheel) and on the opposite side of the block compared to front wheel drive installations.