Power output of the other engines was increased marginally. An HO version of the 350В cuВ in (5.7В L) with a revised cam was also offered starting in that year, which developed 320В hp (239В kW). Also for the 1968 model, the 326В cuВ in (5.3В L) engine was replaced by the Pontiac 350В cuВ in (5.7В L) V8, which actually displaced 354В cuВ in (5.8В L), and produced 265В hp (198В kW) with a two-barrel carburetor. The 230В cuВ in (3.8В L) engines were subsequently enlarged for 1968 to 250 cubic inches(4.1 liters), the base version developing an increased 175В hp (130В kW) using a one-barrel carburetor, and the high-output Sprint version the same 215В hp with a four-barrel carburetor. Power for the Ram Air package was the same as the conventional 400В HO, but peaked at 5,200 rpm. A 'Ram Air' option was also available, providing functional hood scoops, higher flow heads with stronger valve springs, and a hotter camshaft. All 1967вЂ“1968 400В CI engines had throttle restrictors that blocked the carburetors' secondaries from fully opening. Most buyers opted for one of three V8s: the 326В cuВ in (5.3В L) with a two-barrel carburetor producing 250В hp (186В kW) the four-barrel 'HO' (high output) 326, producing 285В hp (213В kW) or the 325В hp (242В kW) 400В cuВ in (6.6В L) from the GTO. The 'Sprint' model six came with a four-barrel carburetor, developing 215В hp (160В kW). Based on the architecture of the standardД¬hevrolet 230В cuВ in (3.8В L) inline-six, it was fitted with a one-barrel carburetor and rated at 165В hp (123В kW). The 1967 base model Firebird came equipped with the Pontiac 230В cuВ in (3.8В L) SOHC inline-six. However, GM feared this would cut into Chevrolet Corvette sales, and gave Pontiac a piece of the ' pony car' market through sharing the F-body platform with Chevrolet. Originally, the car was a 'consolation prize' for Pontiac, which had desired to produce a two-seat sports car based on its original Banshee concept car. Both a two-door hardtop and a convertible were offered through the 1969 model year. The Firebird's rear 'slit' taillights were inspired by the 1966вЂ“1967 Pontiac GTO. Announcing a Pontiac styling trend, the Firebird's bumpers were integrated into the design of the front end, giving it a more streamlined look than the Camaro. The first generation Firebird had characteristic Coke bottle styling shared with its cousin, the Chevrolet Camaro. See also: GM F platform В§В First Generation, 1967вЂ“1969

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