Initially, General Motors executives wanted an entirely new car for 1957, but production delays necessitated the 1955–56 design for one more year. Ed Cole, chief engineer for Chevrolet, dictated a series of changes that significantly increased the cost of the car. These changes included a new dashboard, sealed cowl, and the relocation of air ducts to the headlight pods, which resulted in the distinctive chrome headlight that helped make the '57 Chevrolet a classic. Fourteen-inch wheels replaced the fifteen-inch wheels from previous years to give the car a lower stance, and a wide grille was used to give the car a wider look from the front. The now famous '57 Chevrolet tailfins were designed to duplicate the wide look in the rear. Bel Air models were given gold trim: the grille, front fender chevrons, hood, and trunk script were all rendered in anodized gold. The 1957 Chevrolets did not have an oil pressure gauge or a voltmeter. The base engine was an inline 6-cylinder called the Blue Flame Six. The engine was smoother running than the V-8. Carburetion came from a single one-barrel carburetor.