with a "dramatic reverse-sloped C-pillar" as well as borrowing the Nash-Healey's Pinin Farina-designed inboard, grille-mounted headlamps. For the 1957 model year the Rambler was established as a separate marque. The 1957 Rambler Rebel debuted as a special model in the Rambler line showcasing AMC's big new V8 engine. The Rebel became the first factory-produced lightweight muscle car. First generation 1957 American Motors surprised most observers with the December 1956 introduction of the Rambler Rebel – "a veritable supercar". The new 1957 model debuted as a high-performance vehicle that combined AMC's lightweight wheelbase Rambler four-door hardtop body with AMC's newly introduced V8 engine. This made it the first-time that a large block V8 was installed in a mid-size car in the post-World War II marketplace. General Motors, Ford, and Chrysler offered no intermediate-sized cars whatsoever. Although AMC was best known for their reliable economy cars, this special model came with a bigger engine than anything found at Chevrolet, Ford, or Plymouth—the Rambler's most popular competitors at that time. The Rebel's US$2,786 MSRP base price ($ in dollars ) was economical for the amount of power provided. It was the fastest stock American sedan, according to Motor Trend. All Rebels came with a manual (with overdrive unit) or GM's four-speed Hydra-Matic automatic transmission, as well as other performance enhancements such as a dual exhaust system, heavy-duty suspension with Gabriel (brand) shock absorbers, and front sway bar. The Rebel was capable of 0 to 60 mph (0-97 km/h) acceleration in just 7.5 seconds with its standard carbureted engine. The car's light monocoque (unibody) construction afforded a power-to-weight ratio of about 13 pounds per horsepower, a better ratio than other 1957 model year automobiles and a contrast to Volkswagen's 45. The Rebel's engine also differed from the 327s installed in the 1957 Ambassador and Hudson Hornet models because it used mechanical valve lifters and a higher compression ratio. Since both engines were rated at 255 hp, it is probable that the Rebel's was underrated. Power steering and power drum brakes were also standard, as on all Rambler Custom models. The car was available only in silver metallic paint accented with gold anodized aluminum inserts along the sides. Padded dashboards and visors, rear child proof door locks, and seat belts were all optional. A total of 1,500 Rebels were produced in 1957. Integrated air conditioning system, the All Weather Eye was a $345 option. The