 The 1973 Firebird Trans Am's factory applied hood decal, a John Schinella restylized interpretation of the Native American fire bird, took up most of the available space on the hood.Also in 1973, the new Super Duty 455 engine ("Super Duty" harkening back to Pontiac's Racing Engines) was introduced.Although it was originally supposed to be available in GTOs and Firebirds, only a few SD 455 engines made it into Firebird Trans Ams that year.