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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.
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.
The 1974 models featured a redesigned "shovel-nose" front end and new wide "slotted" taillights. The 400, 455, and SD-455 engines were offered in the Trans Am and Formula models during 1974. A June 1974 test of a newly delivered, privately owned SD-455 Trans Am appeared in Super Stock and Drag Illustrated. With an unmodified car and a test ...
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 ...
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The SD 455 was available for one more year in the Trans Am. As emissions regulations were increasing, two of the three iterations of the 455 cu in (7.5 L) engine were discontinued after 1974, with the final version of the 455 remaining available through 1976.
Most of the drop was attributable to the new rating system (which now reflected an engine in as-installed condition with mufflers, accessories, and standard intake). The engines were relatively little changed from 1971. The 455 cu in (7.5 L) HO engine was optional, essentially similar to that used in the Trans Am.
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