1973 vs 1974.
Pontiac Firebird Trans Am 455 Super Duty vs Pontiac Firebird Trans Am 455 Super Duty
| Category | Firebird Trans Am | Firebird Trans Am |
|---|---|---|
| Engine layout | 7.5 l V8 | 7.5 l V8 |
| Max power (ps / bhp) | 314 / 310 | 314 / 310 |
| Max torque (Nm / lb-ft) | 529 / 390 | 529 / 390 |
| Curb weight (kg / lb) | 1691 / 3728 | 1661 / 3662 |
| Power / tonne (ps / bhp) | 186 / 183 | 189 / 187 |
Performance
| Category | Firebird Trans Am | Firebird Trans Am |
|---|---|---|
| Top speed | 250 kph (155 mph) | 274 kph (170 mph) |
Summary
| Category | Firebird Trans Am | Firebird Trans Am |
|---|---|---|
| Track Performance | 0 | 0 |
| Straight line speed | 76 | 100 |
| Total | 76 | 100 |
Verdict
Firebird Trans Am 455 Super Duty is the fastest by considerable margin.
However, FastestLaps.com does not have enough lap times and performance data to make this comparison conclusive.
This comparison has been viewed 3.2k times.
donk 5m ago
73 would be lighter because of the federal 20 mph bumper change in 74. You got an extra 22 hp by drilling out the 3 rivets on the back block off plate on the shaker hood and turning the Ram Air back on. First thing I did when I got my 74 SD home from the dealer . Next change was ditch the 308 ring and pinion and put in a 372. That really woke up the car. A set of headers and glasspacks were worth another 100 horses. Look at the messed up exhaust with the sideways muffler and all the bends on the factory exhaust.
