It's no secret that Muscle Car performance was on the decline after 1970 or so, but Pontiac engineers pressed on when they created the Super Duty Trans Am package, which was still a screamer in 1974. The SD-455 was a remarkable engine, a legit race-bred machine among the plummeting compression ratios and horsepower levels of other V8s of the day. This is a great example of a low-mile and correct 1974 SD-455 Trans Am..
Take a look at the amazing display of "27" 1970 & 1971 Hemi 'Cuda and Hemi Challenger Convertibles on display at the 2015 Muscle Car and Corvette Nationals in Chicago, IL. There were only 42 of these 426 Hemi convertibles built, and there has never been more than 9 in one place before this event. Truly an awesome display.