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Motor Trend tested a 1971 GTO with the 455, four-speed transmission, and 3.90 axle, and obtained a 0–60 mph acceleration time of 6.1 seconds and a quarter mile acceleration time of 13.4 seconds at 102 mph (164 km/h).
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The top-of-the-line GTO engine for 1971 was the new 455 HO with 8.4 compression, rated at 335 hp (250 kW) at 4,800 rpm and 480 lb⋅ft (651 N⋅m) at 3,600 rpm.
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It had 310 hp (230 kW) SAE net at 4,400 rpm in the GTO and 305 hp (227 kW) SAE net in the Firebird Trans Am or Formula 455 with Ram Air induction(Formula; shaker hood inlet on Trans Am).