with solid tappets, and other upgrades which increased output to . At the same time, the Dodge Dart Charger was offered. The Dart Chargers were yellow Dart GT hardtops with black interiors, Commando 273 engines, premium mechanical and trim specifications, and special "Charger" badging. They were the first Dodge models to bear the "Charger" name. The following year the larger B-body Dodge Charger was introduced, and the "Charger" name was thenceforth associated with Dart models only in the "Charger 225" marketing name for the optional larger 6-cylinder engine. Other new options for 1965 included upgraded suspension components and larger wheels and tires. Factory-installed air conditioning became available after the start of the 1965 model year, as well as disc brakes, which required the wheels to clear the calipers. Front seat belts became standard. Fourth generation (1967–1976) Engines The Slant-6 engine remained standard equipment, though its power rating rose from to for 1967, owing to the installation of the 225 engine's 1 barrel Carter BBD or Holley 1904 series carburetor and the revised camshaft the bigger engine had received in 1965. For North American domestic-market vehicles, the base 170 engine was replaced for 1970 with a stronger new version of the slant-6. This new base engine was also less costly to make, for unlike the previous 170 engine, the 198 used the same block as the 225. The smaller displacement was achieved with a new crankshaft ( stroke vs. the stroke of the 225 crank) and connecting rods ( long vs. the rods in the 225). Nevertheless, the 225 remained an upgrade option. The 2-barrel small-block V8 was supplanted on the option list in 1968 by a 2-barrel engine. The 318 was rated at versus the 2-barrel carbureted 273's . At the same time the 4-barrel carbureted 273 was replaced on the options list by the 4-barrel carbureted available only in the 1968–1972 Swinger and the hottest Dart, the performance-oriented GTS models. The Dart GTS came standard with the V8. A big-block was optional. 1967 The Dart and its sister model—the Plymouth Valiant—were substantially redesigned for the 1967 model year. In addition to new styling, the cars received revised steering systems, wider front track and frame rail spacing, and redesigned K-members capable of accepting larger engines. The Dart kept this basic form, with facelifts consisting of revised front and rear-end styling and interior trim, until the end of A-body production in