a Buick trademark. This chrome-plated strip started above the front wheel, after which it gently curved down nearly to the rocker panel just before the rear wheel, and then curved around the rear wheel in a quarter of a circle to go straight back to the tail-light. The "Riviera trim", as it was initially called, was also made available on the Roadmaster convertible late in the model year. With a total of 88,130 sold, the all-time annual record for Roadmaster, the model accounted for 27% of all Buick sales, a high proportion despite its price that was only slightly less than a Cadillac Series 61. The 1950 restyling featured a "toothy" grille. The Sweepspear design was made standard on most body styles at the beginning of the 1950 model year, and on the station wagon and a new long-wheelbase sedan mid-year. The long-wheelbase sedan was lengthened by ). Like the convertibles, the Riviera and the long-wheelbase sedan came with power windows and power seats as standard equipment. Overall Roadmaster sales fell to 75,034, with Roadmaster's share of total Buick output plummeting to 12%. In 1951 the long-wheelbase sedan was also called a Riviera although it was not a hardtop. The Sedanet and regular wheelbase sedan were discontinued. Styling changes were minimal in 1951 and 1952. Power steering was added as an option in 1952 and horsepower climbed to 170 primarily to a new four-barrel carburetor. Sales continued to decrease to about 66,000 in 1951 and totaled 51,000 units in 1952. A new V8 engine was introduced for 1953, Buick's Golden Anniversary year. Although the Nailhead (as it was popularly called) was nearly identical in displacement to the straight-eight Fireball (322 versus 320 cubic inches), it was shorter, four inches (102 mm) lower, and lighter, but with , it was 11% more powerful. The compression ratio increased from 7.50:1 to 8.50:1 and torque increased from . The compact dimensions of the V8 engine enabled Buick to reduce Roadmaster's wheelbase by across the line, although styling differences behind the engine cowl, apart from new V-8 emblem hubcaps, were largely nonexistent. Buick also introduced a new "Twin-Turbine" Dynaflow as a companion for the V8 engine. Estimated to increase torque at the wheels by 10 percent, the new transmission provided faster and quieter acceleration at reduced engine speeds. Both power steering and power brakes were made standard. Air conditioning was a new option and,