The 170 cu in (2.8 L) Slant-6 engine remained standard equipment, though its power rating rose from 101 bhp (75 kW) to 115 bhp (86 kW) for 1967, owing to the installation of the 225 engine's larger 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 198 cu in (3.2 L) 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 (3.64 in (92 mm) stroke vs. the 4.125 in (104.8 mm) stroke of the 225 crank) and connecting rods (7.006 in (178.0 mm) long vs. the 6.67 in (169 mm) rods in the 225). Nevertheless, the 225 remained an upgrade option. The 2-barrel 273 cu in (4.5 L) small-block V8 was replaced on the option list in 1968 by a 318 cu in (5.2 L) 2-barrel engine. The 318 was rated at 230 bhp (170 kW) versus the 2-barrel carbureted 273's 180 bhp (130 kW). At the same time the 4-barrel carbureted 273 235 bhp (175 kW) was replaced on the options list by the 275 bhp (205 kW) 4-barrel carbureted 340 cu in (5.6 L) available only in the 1968–1972 Swinger and the hottest Dart, the performance-oriented GTS models. The Dart GTS came standard with the 340 cu in (5.6 L) V8. A 300 hp (220 kW) 383 cu in (6.3 L) big-block was optional. In 1968, fifty cars were made generally available by special order with the Hemi 426 cu in (7.0 l) 425 bhp (317 kW; 431 PS) engine, to satisfy the NHRA sanction rules. These cars were removed from the regular assembly line and sent to the Hurst Corporation for fitment of the 426 engine. In 1969, the 440 cu in (7.2 l) became available as a regular production option. According to Chrysler Corporations "MOPAR Direct Connection A Body Performance Manual", 1909 versions in 1969 were produced with this option.
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 would keep this basic form, with facelifts consisting of revised front and rear end styling and interior trim, until the end of A-body production in 1976 (North America) 1981 (South America).
The restyled Dart for 1967 featured a rear window with compound inverse curves. This created a unique appearance at the rear of the greenhouse, but tended to collect snow and created thick C-pillars that looked formal but created blindspots for drivers. Curved side glass was used for the first time on a Chrysler compact. Up front, there was a new dual-plane front end contour: the center section of the grille, bumper and leading edge of the hood were recessed from the front plane of the car. The single headlamps were placed forward of the recessed center section, defining the front plane. Park/turn lamps were set into the grille, in the corners formed by the transition area between the recessed and forward sections. This same front end treatment, with minor cosmetic changes to the grille and the park/turn lamps relocated to the front bumper, was also used by Chrysler Australia for their 1967 VE-model Valiant.
With the new design, changes were made to the Dart lineup, beginning with the elimination of its station wagons and the base model's "170" designation. The only body styles were the 2- and 4-door sedans, the hardtop, and the convertible. The base 170 model was now badged simply as Dart. The 270 and GT versions carried on unchanged for the most part. In late 1967, the GTS model debuted but was built in limited quantities due to its lateness in the model year; the 1968 GTS would be, arguably, improved by fitting the new high-output 340 cu in (5.6 L) V8 as standard equipment.
The 1967 Dart, along with all other 1967 Chrysler products, got a new dual-circuit brake hydraulic system to ensure loss of pressure in the front brakes would not prevent the rear brakes working, and vice versa. The system also incorporated a brake system fault telltale on the dashboard.
Source: Wikipedia, 2012