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The 1971 Pontiac 455 HO was Pontiac's first engine to receive a special 800 cu ft/min (23 m 3 /min) Rochester Quadra-jet carburetor with specific jetting. 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 .
In mid-March 1971, a second design change for the GT-37 switched the striping to a reflective sword-style stripe sometimes referred to as the 1971 ½ GT-37. 1971 also afforded the customer the opportunity to choose any of Pontiac's optional V8s such as 350, 400, or 455 cubic inch models, including the 455 High Output (HO) engine. The 455 had ...
Engine options remained mostly unchanged, however, the L75 455 engine was dropped, but the LS5 455 HO remained as an option for the Formula and standard for the Trans Am. [27] Pontiac advertised the 1972 455 HO as de-tuned to 300 hp, but the engine was unchanged from 1971. [28]
The standard engine for 1971-72 was a 455 cubic-inch V8 with two-barrel carburetor that was rated at 280 gross horsepower for 1971 and 185 net horsepower for 1972 and optionally available was the four-barrel version of the 455 rated at 325 gross horsepower in 1971 and 250 net horsepower in 1972.
A new option was Pontiac's D-port 455 cu in (7.5 L) HO engine (different from the round-port offerings of the 1971 and 1972 cars), now that GM had rescinded its earlier ban on intermediates with engines larger than 400 cu in (6.6 L).
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Optional engines included a 455 cubic-inch V8 with two- or four-barrel carburetion and respective horsepower ratings of 285 and 325, respectively. All Pontiac engines for 1971 were designed to run on lower-octane regular leaded, low lead or unleaded gasoline thanks to a GM corporate edict, necessitating reductions in compression ratios.
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