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Like the 326, it was offered in both 2-barrel and 4-barrel versions. In 1968, a 320 hp (239 kW) HO option was offered in the Tempest and Firebird. The 1969 HO 350 HO was equipped with the 400 cu in (6.6 L)'s large valve heads (# 48's) and the 400 HO camshaft and rated at 330 hp (246 kW).
1989 Pontiac Firebird Turbo Trans Am 1985 Pontiac Firebird Trans Am interior. For 1989, most Firebird models were nearly identical to those made in 1988. The Trans-Am GTA and Formula 350 models were fitted with upgraded Corvette 5.7 Liter L98 Engines, replacing the 5.7 Liter L98 engine version that powered the 1987 and 1988 models.
The ten horsepower increase over 1968's engines was due to a different cam and the use of the #48 big valve heads, the same head used on the Ram Air 3 400-cubic inch 366 hp (273 kW) engine and the 428-HO engine at 390 hp (291 kW). The 1969 model year would be the last high-performance version of the Pontiac 350.
The Oldsmobile engine was very similar to the Buick engine, but not identical: it had larger wedge combustion chambers with flat-topped (rather than domed) pistons, six bolts rather than five per cylinder head, and slightly larger intake valves; the valves were actuated by shaft-mounted rocker arms like the Buick and Pontiac versions, but the ...
1981 Pontiac Firebird Turbo Trans Am. 1981 became the final year for the second generation Pontiac Firebird. The three engine options were unchanged for the model line-up, however, the option for a four-speed Borg Warner Super T-10 was re-introduced for the Formula and Trans Am, but was only available with the Chevrolet sourced LG4 305 5.0 ...
Quite different from Pontiac's previous straight-6s, it had a smaller bore 3.75 in (95.3 mm) than the 15 cu in (250 cc) larger Chevrolet engine and a Chevy bellhousing, but its flywheel/flexplate bolt pattern was Pontiac's.