The original Plymouth Duster is a semi-fastback two-door coupe version of the compact-sized Plymouth Valiant automobile that was marketed by Plymouth in the U.S. from 1970 to 1976 model years.
History
The Duster coupe provided the compact-sized Plymouth Valiant with a sporty body style to attract customers. The car was a $15 million effort to update the compact Valiant for the 1970 model year. The Valiant badge appeared only on the first model year Dusters, and continued to be used on all the companion 4-door sedan and 2-door Valiant Scamp hardtop models. The Duster was built on the Valiant platform and shared the same front end sheet metal, but featured a different design from the cowl back.
The Duster was also positioned to compete with Ford's slightly smaller semi-fastback Maverick compact car and the AMC Hornet that were both also introduced in 1970, and the slightly larger semi-fastback Chevrolet Nova whose design was introduced in 1968. While the Maverick and Nova were offered in a 4-door sedan body style, the Duster nameplate was used only for the 2-door coupe. The Duster was also marketed as an alternative to the original Volkswagen Beetle, as well as the new class of domestic subcompact cars such as the Chevrolet Vega.
Numerous trim and option package variants of the Duster were offered with names that included Feather Duster, Gold Duster, Silver Duster, Space Duster, Duster Twister, Duster 340 and Duster 360. These marketing variations of the basic Duster design targeted customers seeking economy, cargo capacity, and/or performance.
Duster logo was, and still remains, one of the most recognizable automobile logos. Chrysler employee, Thomas Bertsch (1952-1987), created the "twister" logo and font. Many corresponding graphics were used for different trim packages over the years. Bertsch was the director of the interior styling and design studio for much of his career.
Year-by-year changes
1970
The Plymouth Duster introduced in late-1969 for the 1970 model year was all Valiant from the cowl forward, but the rest of the car's sheet metal, save door skins, was completely different. The design incorporated a semi-fastback roof and a special rear valance with for having no bezels. The door glass was operated by a new regulator mechanism, required to fit the much more radical tumblehome (reduced side glass radius), and the windshield was more steeply raked. For 1970 only, a small Valiant badge went on the front fenders just above the Duster badge.
The 1970 Duster was available in two models — the standard Duster and a performance-oriented Duster 340. Engine options were 198 cu in (3.2 L) and 225 cu in (3.7 L) versions of Chrysler's Slant Six, as well as the 318 cu in (5.2 L) and 340 cu in (5.6 L) LA-series V8s.
At midyear, a Gold Duster trim package was added. The Gold Duster package came with either the " badging, gold stripes on the sides and rear, wall-to-wall carpeting, pleated, all-vinyl seats, whitewalls, wheel covers, a deluxe insulation package, and a canopy vinyl roof. The Gold Duster was offered through /Valiant 1975 small cars from Plymouth" printed 8-1-74 form no. 81-005-0003 page 2 outlines the Gold Duster, of which 24,817 were equipped with the 340 engine.
1971
The Duster was a success for Plymouth, so much so that in 1971 Dodge requested and received their own version, the Demon. In response, Plymouth was given a version of the Dodge Dart Swinger 2-door hardtop named the Plymouth Valiant Scamp.
For 1971, only small changes were made to the Duster. The "Valiant" fender badges and "Plymouth" grille logotype were deleted. A new trim package was released, called the Duster Twister. The Twister package presented the appearance of the Duster 340, but came only with the base I6 or 318 V8. The Twister's appearance package included special side stripes that mimicked the Duster 340 Wedge stripes, a matte-black hood and the 340's special shark-tooth grille. A nonfunctional dual hood scoop and rear spoiler appearance package was available, as were high-back bucket seats and dual exhaust.
A new electronic "breakerless" ignition became optional on the 340 V8 late in 1971 model year. In 1971, 186,478 Plymouth Dusters were built, with 12,886 being the higher horsepower 340 cubic inch fastback models.
1972
The Duster was not changed significantly for 1972. New surface-mount sidemarker lights replaced the previous flush-mount items, the taillamps became larger, one-piece units. The power rating of the 340 V8 was reduced from 275 bhp (205 kW) to 245 bhp (183 kW) due in part to a reduction in compression ratio from 10.2:1 to 8.5:1, as well as changing the intake valves from 2.02 in (51 mm) to 1.88 in (48 mm). All horsepower rating numbers, even on unchanged engines, decreased for 1972 due to a new rating protocol. Chrysler's electronic ignition became standard on the 340 models in 1972. Also, there was a 1 year only air cleaner that had a vacuum operated door at the bottom to allow for additional air flow when the throttle is depressed.
1973
Following the design changes on the Valiant models, the Duster also received a new hood, grille, front fenders, bumpers, and taillights for 1973. The taillights on previous years mounted from the inside and had a flush appearance. Starting in 1973, the taillights were mounted from the outside and were trimmed in chrome. These remained unchanged through 1976. The Dodge version, the Demon, was rebranded "Dart Sport" in response to church groups opposition to the word, "Demon."
Other changes were in store for the Plymouth Duster. Simpler single-piston slider-type disc brake calipers were introduced for 1973 (standard on 318-powered cars and with power-assist on 340 models), replacing the Kelsey Hayes four-piston calipers. Disc brake-equipped Dusters now had the more-common 5-lugs on 4.5" wheel bolt pattern. All 340 and some 318 engine-equipped cars received the simplified 8.25" rear axle assembly (with wheel bearings riding directly on the axle shaft and endplay being taken by C-clips); these axles also featured the 5-on-4.5" wheel bolt pattern. (This axle assembly replaced the 8.75" "drop-out" arrangement seen on some 1966-1972 A-bodies). The 225-powered cars retained the 5-lugs on 4" pattern on vehicles with the standard drum brakes. A three speed Torque Flight automatic along with a manual transmission was offered with the 225 slant six. All models received larger front wheel bearings and increased spindle diameter. Electronic ignition became standard across the board.
Also a Space Duster package was offered. This allowed the back bench seat to be folded down, allowing more space to carry cargo. There is also a security flap allowing private things to be stashed away from view of others.
A new, metal sunroof was optional for 1973. The rear window defroster/defogger was upgraded to an electric-grid style for 1973, which replaced the previous recessed package shelf air blower.
Source: Wikipedia
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