This model variant soon became known as the fastest Pontiac ever. These included a strengthened cylinder block, with four-bolt main bearings to help rigidity. 20: 1973 Pontiac Firebird Trans Am SD-455Ī Super Duty (SD) 455 was the beating heart of the 1973 Firebird, and while that wasn’t a new engine, per se, it had a litany of modifications to help bolster performance.A total of 3,100 examples of the 442 were built, but only 264 of them were convertibles. The W30 package tacked on extra speed and efficiency bits, including a functional air scoop on the hood, an aluminum intake manifold, and an upgraded cam. The beefed-up beauty has a four-barrel carb, four-speed manual, a dual-plate clutch, and a 455 cubic-inch V-8 making 370 hp. Vying to compete with Pontiac’s GTO, the honchos at Oldsmobile ginned up this 442 option, derived from the “police apprehender” version of its Cutlass. The model was only produced in 19, with less than 1,400 examples leaving the assembly plant. With 375 hp, the Boss 429 could hustle through the quarter-mile with a respectable time of 14 seconds flat, and reach a top speed of 120 mph. Image Credit: Barrett-Jackson Auction Company LLC.īack in 1970, a Mustang Boss 429 would’ve set you back $4,087 (about $33,000 in today’s dollars). The “Bee” in the moniker is believed to refer to the car’s “B” platform body style, while the “Super” is self-explanatory when considering the power train. And the 390 hp V-8 features a new-at-the-time configuration of three two-barrel carburetors.Įngineers also tinkered with a number of engine and suspension components to increase power and speed. This mid-sized muscle option from Dodge was conceived and launched halfway through 1965-hence the odd nomenclature-and aimed at attracting a thriftier consumer with a need for Mopar. An upgraded suspension, larger brakes, wheels, and tires, as well as a less-restrictive exhaust, helped translate all that oomph to the road. Hiding behind those rotating headlamps is a 390 cubic-inch Marauder GT V-8, good for 320 hp. Among those, 12,000 were gussied up to the GT trim level. Meet Mercury’s most successful launch, the Cougar, with 150,000 built in 1967. And while the original Toronado was front-wheel drive, Leno wisely opted to push all the power to the rear-axle of his modified monster. But that wasn’t enough for Jay Leno, who gave one such Olds the equivalent of automotive steroids by fitting it with a heavily altered aluminum, twin-turbo 425 cubic-inch V-8 LS6 that produces 1,070 hp.įrom the outside, this muscular Oldsmobile looks stock, but it’s actually riding on a revamped C5 Corvette chassis and suspension. Stock examples of the 1966 Oldsmobile Toronado came with a 7.0-liter V-8 offering 385 hp.
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