Plymouth Duster 340 and 360 specifications by year

Independent · Source-led · American performance history Issue 01 · 1951–2023

Blue 1970 Plymouth Duster 340 coupe with a white side stripe and Duster 340 fender script, front three-quarter — 1970 Plymouth Duster 340 in blue with a white side stripe, the first year of the Duster Photo: Greg Gjerdingen from Willmar, USA, CC BY 2.0, via Wikimedia Commons

1970

Measure	Value	Applies to
Wheelbase	108 in	Duster
Overall length	188.4 in	Duster
Overall width	71.6 in	Duster
Overall height	52.1 in	Duster V8
Tread, front / rear	57.4 / 55.6 in	Duster
Tires	E70 x 14	Duster 340
Rear axle ratio	3.23:1 standard; 3.55 and 3.91 optional	340, all transmissions
Overall height	52.6 in	Duster six (body 29)
Curb weight (with automatic)	2,930 lb	Duster six
Curb weight (with automatic)	3,015 lb	Duster V8
Curb weight (with automatic)	3,275 lb	Duster 340
Shipping weight	2,790 (six) / 2,865 (V8) / 3,110 (Duster 340) lb	Duster VL29 and Duster 340 VS29
Standard tires	6.95x14 (198, 225, 318 without A/C); D78x14 (318 with A/C); E70x14 on 14 x 5.5J rims (340)	Duster and Duster 340
Front disc brakes	4-piston caliper, 10.79 in vented rotor; swept area 314.7 sq in	Duster 340 (standard) and cars with optional discs
Suspension rates at wheel, front / rear	100 / 132 lb/in	340 (0.87 in torsion bars, 6-leaf rear springs, 0.88 in front stabilizer standard)

1971

Measure	Value	Applies to
Wheelbase	108 in	Duster coupe
Standard tires	E70 x 14	Duster 340
Rear axle	3.23:1 standard; 8 3/4 in ring gear	Duster 340
Brakes	10 in heavy-duty drums standard; front discs optional	Duster 340
Compression ratio	10.3:1	340 4-bbl

1972

Measure	Value	Applies to
Wheelbase	108 in	Duster 2-door coupe
Overall length	188.4 in	Duster 2-door coupe
Overall width	71 in	Duster 2-door coupe
Overall height	52.7 (six) / 53.1 (V8) in	Duster 2-door coupe
Tread, front / rear	57.5 / 55.6 in	Duster 2-door coupe
Luggage capacity, usable	15.9 cu ft	Duster 2-door coupe (estimated by the source)
Rear axle ratio	3.23:1 standard with all transmissions; 3.55 with Sure-Grip	340
Standard tires	E70x14 bias-belted	Duster 340
Clutch diameter	10.5 in	318 and 340 (9.25 in with sixes)
Front disc brake rotor	10.79 in outer diameter; 314.8 sq in total swept area with discs	Valiant line, optional discs

1973

Measure	Value	Applies to
Wheelbase	108 in	Duster coupe
Overall length	195.8 in	Duster coupe
Overall width	71.8 in	Duster coupe
Overall height	53.2 in	Duster 340 (53.1 other Dusters)
Tread, front / rear	59.1 / 55.6 in	Duster coupe
Luggage capacity	15.9 (56.0 with Spacemaker Pak) cu ft	Duster coupe
Clutch diameter	10.5 in	318 and 340

1974

Measure	Value	Applies to
Wheelbase	108 in	Duster coupe
Overall length	194.1 in	Duster coupe
Overall width	71.8 in	Duster coupe
Overall height	53.1 in	Duster coupe
Tread, front / rear	59.1 / 55.4 in	Duster coupe
Curb weight (estimated, not for licensing)	3,395 lb	Duster 360
Curb weight (estimated, not for licensing)	3,055 (six) / 3,155 (V8) lb	Duster
Rear axle ratios, 360 4-bbl	3.21 standard with 3- and 4-speed manuals; 2.94 standard with automatic (3.21 optional); Sure-Grip 3.21 or 3.55	Duster 360
Standard tires	E70x14 bias-belted blackwall on 5.5JJ rims	Duster 360
Front torsion bars / rear springs	0.89 in heavy-duty torsion bars; 6-leaf rear springs; 0.80 in front sway bar	Duster 360
Turning diameter, curb to curb	37.89 ft	Duster 360 (38.21 other Dusters)
Clutch diameter	10.5 in	360 (heavy-duty) and 318

1975

Measure	Value	Applies to
Wheelbase	108 in	Duster 2-door coupe
Overall length	196.1 in	Duster 2-door coupe
Overall height	53.2 in	Duster 2-door coupe
Overall width	71 in	Duster 2-door coupe
Tread, front / rear	59.1 / 55.6 in	Duster 2-door coupe
Wheels and tires	5 1/2 x 14 wheels; E70 bias-belted tires	Duster 360
Rear axle	8 1/4 in	Duster 360

1976

Measure	Value	Applies to
Wheelbase	108 in	Duster 2-door
Overall length	197 in	Duster 2-door
Overall height	53.4 in	Duster 2-door
Overall width	71.7 in	Duster 2-door
Tread, front / rear	59.2 / 55.6 in	Duster 2-door
Trunk capacity	20.1 cu ft	Duster
Tires / wheels	6.95x14 on 14 x 4.5 (225); D78x14 on 14 x 4.5 (318); E70x14 on 14 x 5.5 (360)	Duster/Valiant
Rear axle ratio, 360 with TorqueFlite	2.94 standard; 3.21 optional (with Sure-Grip)	360 V8

Each year's heading links to that model year's full fact sheet. Specification labels are carried as recorded and not normalized across years, so the same measure may be worded differently from one year to the next.