Power rated in SAE net horsepower conditions was further reduced to 250 hp (190 kW) at 4,400 rpm and 325 lb·ft (441 N·m) at 3,200 rpm torque for the base 400 engine. Optional 455 had the same effect (although peak 3,600 rpm / min.), But considerably more torque. Most of the decline is due to the new rating system (which is now enshrined in the engine as installed condition with mufflers, accessories and standard intake). The 1972 Pontiac GTO engines were relatively little changed since 1971 Pontiac GTO.

A very rare option was the 1972 Pontiac GTO 455 HO engine, essentially similar to those in the Trans Am, it was rated at 300 hp (220 kW) at 4,000 rpm and 415 lb·ft (563 N·m) at 3,200 rpm, and even the new SAE net figures. Despite its modest 8.4:1 compression, this engine was as strong as many older engines with higher gross power, but like all other 1972 Pontiac GTO model engines, it can run on low-lead octane regular, low-leaded or unleaded petrol. Only 646 1972 Pontiac GTO cars with this engine were sold.

Sales fell by 45% to 5811. Although not a production 1972 Pontiac GTO convertible to offer the buyer can order a LeMans Sport Coupe with one of the three 1972 Pontiac GTO engines and other power sports opportunities for the Pontiac GTO in all but name it. Even the 1972 Pontiac GTO’s Endura bumper was offered as an option on LeMans/Sport models, with “PONTIAC” spelled out on the driver’s side grille rather than “GTO.”

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