autoevolution 28 May 2021, 7:45 UTC · by Leaving aside the “fake” power drop, which resulted from the U.S. government’s new net ratings system required for the automotive industry, the 1972 Pontiac GTO was pretty similar to its predecessor, coming with very little changes outside, inside, and under the hood. 19 photos Like before, the Firebird was offered in four different versions, namely Coupe, Esprit, Formula and Trans Am, with the 250ci (4.1-liter) six-cylinder still coming as the standard unit on the base models. This engine was rated at 110 horsepower, but again, that was the output according to the new ratings system. Pontiac also offered four more powerful V8 engines in the lineup. First, it was the L30 350ci (5.0-liter) with a net power of 160 horsepower and fitted on the Esprit.