The Plymouth That Humbled Chevelles For Half The Sticker Price
Downsizing and reducing weight seem like pretty obvious routes to performance these days, but a few decades ago brute force was king. In the golden age of the muscle car around the mid ’60s, manufacturers were offering wilder and more powerful engine options seemingly every day, with no limit to what was available under your right foot. Then one carmaker decided to do things differently—and the muscle car scene wouldn’t ever be quite the same again…
A Cloud Was Forming Over The Muscle Car Golden Era
It could be argued that the muscle car era had gotten a little out of control by the end of the ’60s. With young buyers snapping up these V8 monsters in their masses in the mid ’60s, manufacturers were quickly upping the ante, bringing out street machines with weapons grade V8s primarily designed for the racetrack. Suddenly, having a gigantic two-door with 400 to 500 hp under the hood seemed like a pretty normal way of going to the store. But there were clouds brewing. The rock ‘n roll Chevy Chevelle SS and Pontiac GTO may not have noticed it, but insurance companies were starting to bump up rates, while rising gas prices were making it ever harder to justify a muscle car with poor fuel economy. Something needed to change.
Plymouth Had An Idea To Get Buyers Back In The Showrooms
The US economy was slowing in the late ’60s too, which meant that buyers probably weren’t quite so keen to spend their hard-earned cash at car dealers in return for the latest, most over-the-top model. Plymouth noticed this and formulated a two-pronged attack. The first offering was the budget-friendly Road Runner, which was based on Plymouth’s low-end midsize Belvedere trim. Arriving for the 1968 model year, almost all the frills were ditched from the car, and the wildest that owners could go was adding air conditioning and a radio.
But that didn’t really matter when you had a standard 335-horsepower, 383-ci V8 under the hood, with the option to spec a 426 Hemi for a few hundred bucks more. The cut-price Road Runner looked good and it sold well, and Plymouth realized there was a market for people who wanted power and speed, but weren’t too bothered about luxury or a prestigious badge. The next step was a giant killer…
The Plymouth Duster 340 Was A Muscle Car Bruiser’s Worst Nightmare
In a world where small hatchbacks with huge power and all-wheel-drive sedans can run rings around supercars in the right conditions, the idea of downsizing seems obvious. But in the muscle car world of the ’60s, size really did matter. Bigger engines, bigger cars, bigger hype—everything just got larger and larger (aside from the mpg figure). Plymouth realized that it could spruce up the run-of-the-mill Valiant line, taking the chassis and floorpan, suspension and drivetrain, plus some of the styling, and adding a two-door fastback silhouette. The resulting Duster could be bought with a couple of slant sixes and a 318-ci V8, but the one to go for was the 340.
The Duster Combined Power With Low Weight
Delivered with a four-barrel carburetor, dual exhaust, high flow heads, and a forged crankshaft, the 340 pushed out a healthy 275 horsepower and 340 lb-ft of torque. That might not sound like that much, but the car only weighed around 3,110 lbs, meaning the performance was very surprising. Transmission options were either a 3-speed automatic or a 4-speed manual. The Duster 340 package also included an upgraded suspension made up of .87-inch diameter front torsion bars, a .88-inch front anti-roll bar, stiffer rear leaf springs, and heavy-duty shocks. Then Plymouth added front disc brakes, and 14-inch Rallye wheels wearing E70-14 tires. Black stripes and an optional trunk spoiler made the car look more aggressive on the outside. Plymouth was on to a winner.
The Duster Was Cheaper And Almost As Effective As Big Block Cars
While one test clocked the Duster at a low 15-second quarter mile, it seemed like it may have been an anomaly caused by transmission and clutch problems. The Duster 340 was frequently quoted as covering the quarter in the low-14-second range, including by Hemmings, which meant that it could stand up to cars much bigger and more expensive. The Duster was said to be almost 400 lbs lighter than the fearsome Chevrolet Chevelle SS, which came with a mighty big block V8. The Chevelle, says Hemmings, will cover the quarter mile in 14.41 seconds, which puts it on a par with the Duster 340.
But here’s the twist. The Duster 340 was a total bargain, coming in at $2,100. Not only was this $600 less than the $2,700 ’69 Barracuda fastback, it also undercut the $2,809 Chevelle 396 SS. However, with a few choice options, the price of a Chevelle grew to almost $4,000. That was almost double the price of a no-frills Duster 340. And in many ways the Duster was well suited to being basic, letting its performance do the talking.
The Duster 340 Is A Great Choice In 2026
The Duster 340 has gained more recognition of late, so it’s not exactly a forgotten muscle car, but it still makes a lot of sense. It’s lighter, smaller, and probably more usable than a lot of monster muscle cars, but it won’t be embarrassed at the lights. In total, 24,817 Duster 340s were built for 1970, says Hemmings, with 69,115 rolling out of the factory up until 1973. The 1970 cars are officially called the Valiant Duster, but the Valiant part was dropped the following year. The Duster 340 also gained a “sharktooth” grille, but the following year it produced a little less power on paper. The SAE Net standard and a reduction of compression meant an output of 240 hp. In 1974, the 340 V8 was replaced with a 360.
The Duster Remains An Affordable Entry Into Classic Muscle Cars
A 1970 Plymouth Valiant Duster 340 will set you back $29,500 in good condition, says Hagerty’s Valuation Tools, with 1971 cars costing a little more at $33,900. The prices drop to $28,200 for 1972, and $26,100 for 1973. By comparison, a 1970 Chevrolet Chevelle SS 396 will cost $70,500 in 2026, so more than double the price. The Chevelle is an icon, and the Duster 340 will probably always remain the underdog. But if you are just entering the muscle car hobby and want something affordable, genuinely unique, and capable of embarrassing a big-block classic, the 340 is worth a look.
Sources: Hemmings.com; Hagerty.com
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