The revised rear styling did not change the 14.1 cubic ft trunk space of the 1969 model. 14-inch wheels became standard equipment, and the slant-6 was replaced by a larger version for improved base-model performance and greater manufacturing economy—the 198 used the same block as the 225, while the 170 had used a different block. Changes to the fuel system improved drivability, economy, and emission control. Part-throttle downshift was added to the 8-cylinder automatic transmissions. In compliance with FMVSS 108, side marker lights and reflectors were installed at all four corners. 1970 Darts for the US and Canadian markets were built in Canada at the Windsor, Ontario, or Los Angeles, California assembly plant. All 1970 Darts got the federally mandated steering column and ignition lock. The "Swinger" name was applied to all the Dart two-door hardtops except in the high-line custom series. Other changes were made to the Dart line to avoid internal competition with Dodge's new Challenger: the Dart convertible was discontinued along with the optional V8, leaving the 340 4-barrel V8 as the top Dart engine. The performance model in the Dart line for 1970 was the Swinger 340 2-door hardtop. The 1970 Swinger 340 came with functional hood scoops with 340 emblems. Standard equipment included front disc brakes (only on the Swinger), heavy-duty "Rallye" suspension, a 3.23:1 rear axle ratio, fiberglass-belted bias-ply tires mounted to 14 × 5½ inch steel wheels, and a bumblebee stripe. Optional equipment included an upgrade over the standard bench seat with all-vinyl bucket seats, with which a center console could be ordered. A performance hood upgrade with scoops was painted flat black with hood tie-down pins. Mechanical options included power-assisted brakes and steering. Rallye wheels and wire wheel covers were also optional, as was a 6000 rpm tachometer and a vinyl roof covering in black or white. 1971 For 1971, Chrysler introduced a 2-door hardtop in the Valiant line called the Scamp. It was the same car as the Swinger with a Valiant front clip. The 1970 Dart's dual tail lamps were given over to the badge-engineered Scamp, while the 1971 Dart received new smaller quad taillamps that would be used through 1973. The custom 2-door hardtop coupe became the Swinger, and the standard Swinger became the Swinger Special. Dodge gained a version of Plymouth's popular Valiant-based fastback Duster which was to be named the Beaver, but when Chrysler's marketing department learned