In 1956, when 42-year-old Semon "Bunkie" Knudsen became general manager of Pontiac, alongside new heads of engineering, E. M. Estes and John DeLorean, Knudsen immediately began reworking the brand's image. One of the first steps involved the removal of the famous trademark "silver streaks" from the hood and deck lid of the 1957 models just weeks before they were introduced. Another step was introducing the first Bonneville—a limited-edition Star Chief convertible that showcased Pontiac's first fuel-injected engine. About 630 Bonnevilles were built for 1957. It was possible to purchase a Cadillac for the price of the Bonneville, the model raised new interest in what Pontiac now called "America's No. 1 Road Car".