Chevrolet 2004 Silverado Automobile Manual - History. In 1952, Ed Cole was promoted to chief engineer of the Chevrolet Motor Division. Four years later, in July 1956, he was named general manager of Chevrolet—GM's largest automotive division—and a vice president of General Motors.. The Chevrolet Omega is an executive car sold by Chevrolet for the Brazilian market. Replacing the Chevrolet Opala, which was a development of the Opel Rekord C, the original Chevrolet Omega was based on the Opel Omega A, and built locally between 1992 and 1998..