1974 Pontiac Trans Am Super-Duty 455

E nthusiasts beware. The Trans Am Super-Duty 455 is not to be confused with other Pontiac models that came equipped with 455 cubic inch engines – a blessing for true enthusiasts. That’s because the Super Duty 455 is based on the 366 cubic inch engine created by Pontiac for use in NASCAR. Although designed for racing, the eventual SD 455 was “adjusted” to meet federal requirements so it could be used in the Trans Am Super-Duty model.

In the minds of many, this exuberant limited-production Trans Am model is the very last in a long and glorious line of American muscle cars that were produced beginning in the early ‘60s and marked by some of the most outrageous and exciting street machines ever imagined.

All SD 455 engines were hand assembled and came equipped with a reinforced block, special camshaft, aluminum pistons, oversize valves and exhaust manifolds that more closely resembled headers. Although the SD 455 engine was rated at 310 horsepower, it more likely produced closer to 370 horses, prompting enthusiasts to describe it as “a street-legal race-prepared engine.”

Along with an adrenaline-pumping engine, the Trans Am Super-Duty came in a comfortable, sporty package that has aged well in today’s world. There were 953 of these pulse-racing '74 Trans Ams built with the Super Duty 455 package. Great VIDEOS at right .
-Wayne Lawrence

Find your Trans Am at bestofshowautomotive

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1974 Trans Am Super-Duty 455

1974 Trans Am Super-Duty 455

A detuned race engine in a great-looking body. Don't miss the behind-the-wheel videos inside.

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