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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).
Pontiac Firebird Formula 400 (1970-1971) Pontiac Firebird Trans Am (1970) Yenko Nova (1970) 1971. AMC Hornet Sportabout (1971) BMW 2800 Bavaria (1971-1975)
The 1971 455 HO was rated at 335 hp (250 kW) at 4,800 rpm and 480 lb⋅ft (651 N⋅m) of torque at 3,200 rpm . The 1971 455 HO was available in the Firebird (optional in Formula; standard in Trans Am), the GTO (standard with "The Judge" package), and the 2-door LeMans, LeMans T-37 (including GT-37), and LeMans Sport.
The 1967 model year saw the introduction of the Pontiac Firebird pony car, a variant of the Chevrolet Camaro. Intermediate-sized cars (Tempest, LeMans, GTO) were mildly face-lifted, but all full-size cars and GTO lost their Tri-Power engine option, though they did get a larger 400 cu in (6.6 L) V8 that replaced the previous 389.
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The Pontiac Firebird went into production contemporaneously and on the same platform as the Camaro. Pontiac entered the Trans-Am Series in 1968, and a year later introduced the Trans-Am Firebird for public purchase. This option came with Pontiac's small journal-series 400 cubic inch engine, which did not qualify for homologation.