When postwar automobile production resumed in the 1946 model year, chrome was more sparingly applied, swept-back fenders were fitted to sedans as well as coupes, and a war-inspired "bombsight" hood ornament was adopted. The instrument panel was two-toned with woodgrains except on convertibles which used body colored panels. Series identification was found on cloisonne emblems centered in the bumper guard front and rear. Compound Carburetion was eliminated and the compression ratio was reduced to 6.60:1. As a consequence the 1946 Roadmaster's horsepower fell from 165 to 144. Torque on the other hand was hardly affected. Nevertheless, Roadmaster’s I-8 still produced more horsepower than a top of the line Chrysler's. Prices, due to wartime inflation, were substantially higher. But the biggest change was in sales proportions. Roadmaster increased its share of Buick sales from four percent in 1941 to 20 percent in 1946, with a total of about 31,400 sold.
In 1947 a new stamped grille with a separate upper bar was used. The Roadmaster name appeared in red-filled script on chrome button within the bumper guard crossbars, front and rear. All new was an Estate wagon body style. It sold 300 units and instantly became the top of the line in the station wagon market.