Oldsmobile replaced their straight-eight flathead engine with an overhead valve V8 engine in 1949, at which time Cadillac's V8 was changed to one with overhead valves. Chrysler replaced its straight-eight with its famous Hemi V-8 for 1951. Hudson retired its straight-eight at the end of the 1952 model year. Buick introduced a (4.0" bore × 3 " stroke = 322 in³ (5.277 L)) V8 in 1953, with similar displacement as their (3 " bore × 4 " stroke = 320.2 in³ (5.247 L)) straight-8, the latter being produced until the end of the 1953 model year. Pontiac maintained production on their straight-eight, as well as a L-head inline six, through the end of the 1954 model year, after which a V8 became standard. Packard ended production of their signature straight-eight at the end of 1954, replacing it with an overhead valve V8.