Of the less than 5,000 that were built, the 455 SD (Super Duty) with a 4-speed manual transmission is one of the rarest birds out there with only 72 produced. Pontiac produced a total of 252 Trans Am?s with 455 SD engines in 1973.
455 Super Duty Engine Legacy
According to Pontiac?s specs, the 455 SD in a 4-speed manual tranny produced 290 horsepower at 4,000 RPM and 395 Lbs/Ft torque at 3,600 RPM. Pretty pathetic when compared to today?s horsepower to displacement ratio, but nonetheless, still a rock star in its day.
What?s the worst thing that could happen to a 455 SD gas guzzler engine? If you guessed the October 1973 Middle Eastern OPEC nations oil embargo, you win.
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