1970 Plymouth Duster 340

Buzz

Following the success of the Road Runner in 1968, Plymouth struck gold again in 1970 with the economical Duster 340. The 1970 Plymouth Duster 340 followed a tried-and-true formula: a cost-effective Valiant platform with a sleek fastback design, paired with Mopar's powerful 340-cid four-barrel V-8 engine.

The compact Duster outperformed the 340 'Cuda in terms of weight, space, and speed. Priced at just $2,547, it was the most affordable option in Plymouth's Rapid Transit System and the only model to feature standard front disc brakes.

The 340 V-8 engine had already established its reputation in previous years, powering underdog Darts and earlier Barracudas to mid-14-second quarter-mile times at nearly 100 mph. Equipped with a Carter AVS four-barrel carburetor and a camshaft timing slightly less aggressive than the 440 Six Pack, it was officially rated at 275 bhp, though experts claimed it delivered closer to 325 bhp.

The Duster featured a heavy-duty three-speed manual transmission as standard, with optional four-speed or TorqueFlite transmissions. A 3.23:1 axle ratio came standard, while 5:1 and 3.91:1 gears, along with a Sure-Grip limited-slip differential, were available for an additional cost.

As part of the Rapid Transit System, the Duster 340 was equipped with performance-enhancing features such as heavy-duty suspension components, a front stabilizer bar, and six-leaf rear springs. Standard tires were E70xl4s mounted on 5.5-inch rally wheels. The car shared the instrument panel with earlier Barracuda models, and buyers could opt for bucket seats and a center console with a floor shifter instead of the standard front bench seat.

Optional features included a pistol-grip shifter for the four-speed transmission, an 8000-rpm tachometer, and power steering. While no scoops were available, the car featured dual exhausts and subtle decals as its only performance-inspired styling cues.

The firm and slightly lowered suspension resulted in a jarring ride and didn't stop the car's front end from pushing through sharp turns. The affordable price also meant some cost-cutting in the interior trim. However, the Duster 340 was a quick muscle car, practical, understated, and full of personality. It was undoubtedly a winning formula!

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The 1970 Plymouth Duster 340

Specifications

Wheelbase, inches: 108.0

Weight, lbs: 3,110

Number built: 24,817

Base price: $2,547

Standard Engine

Type: ohv V-8

Displacement, cid: 340

Fuel system: 1 x 4bbl.

Compression ratio: 10.5:1

Horsepower @ rpm: 275 @ 5000