The F-Series was redesigned for 1953 with a more integrated look. The pickups also acquired their now familiar names: The F-1 now became the F-100, the F-2 now became the F-250, and the F-3 now became the 1 ton F-350. Starting on the 1956 models, Ford offers the very rare "Low GVWR" versions of each model. Optional interior amenities were new, including a dome light, lighter, arm rests, sun visors and a radio. On March 13, 1953, "Ford-O-Matic" automatic transmissions became an option. The 1953 F-100 was the last year for the flathead in the US. Canadian models, however, (Mercury M-Series), retained the flathead. 1954 saw the introduction of the new 239 CID overhead valve Y-block 8 cylinder, dubbed "Power King." The six cylinder engine's displacement was also increased from 215 to 223 CID and power steering was introduced as an option.. In 1955 the 239 Y-block was replaced with the 272 and 292. The 1956 F-100 is a one-year only body style. The 1956 F-100 is easily identified as it has vertical windshield pillars and a wrap around windshield as opposed to the sloped pillars and angled windshield of the 1953-55. The 1956 model also offered a larger wrap-around back window as an option. Second generation trucks were built in Brazil from 1957 to 1962 as the F-100, F-350 and F-600.