Dodge Dart 1971 – Legendary Muscle

The 1971 Dodge Demon 340 was the cheapest way into real Mopar small-block performance, and it arrived wearing a grinning cartoon devil that drew organized protests from religious groups. Under the hood sat a 275-horsepower 340 good for a 14.49-second quarter mile, in a compact that cost roughly half what a big-block Charger did. Only 10,098 were built before Dodge retired the name. Read on to find out why the joke turned into one of the most sought-after A-bodies of the era.

Dodge spent the late sixties building some of the loudest and most expensive muscle cars in America, and then in 1971 it sold one that cost roughly half as much and still managed to make people genuinely angry. Not because it was slow. Because of what was stamped on the fender. Somewhere between the marketing department and the pulpit, a compact Dart variant became one of the very few American cars ever to draw organized religious protest, and the outrage accomplished what no advertising budget could have: it made absolutely everyone remember the name. Five decades later the controversy is a footnote and the car is a bargain that no longer exists. So what exactly did Dodge decide to put on that badge?

The Cheapest Way Into a 340

By 1971 Dodge had reshuffled the Dart lineup around a new performance variant, the Demon 340, aimed squarely at buyers who wanted small-block muscle without the sticker shock of a Charger or a Challenger. The engine was Chrysler’s 340-cubic-inch LA-series V8, rated at 275 horsepower, built with a hot camshaft, hydraulic lifters, and a compression ratio right around 10.3:1. Wrapped in a body that weighed roughly 3,200 pounds, that combination made the Demon genuinely quick rather than merely quick-looking. Period road tests recorded 0-60 mph in 6.5 seconds and a quarter-mile pass of 14.49 seconds at 98.25 mph, numbers that put this compact in the same conversation as big-block cars costing considerably more money and burning considerably more fuel to get there.

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A Badge That Brought Out the Protesters

The window sticker read just over $2,721 new, undercutting almost everything else wearing a performance badge that season, but price is not what made the Demon famous. Dodge paired the name with a grinning cartoon devil clutching a pitchfork, and the reaction from religious groups was immediate and organized, aimed not only at the car but at the Dodge brand itself. Dealers fielded complaints from customers who had never set foot in the showroom. Some buyers reportedly ordered their cars with the emblems deleted at the factory. The controversy generated far more free publicity than any ad campaign could have bought, but it also handed Chrysler a convenient reason to walk away from the nameplate the moment demand began to soften.

The Duster Connection Nobody Mentions

The Demon did not appear out of nowhere. Plymouth had launched the Duster on Chrysler’s compact A-body platform in 1970 and watched it sell in enormous numbers, and Dodge dealers spent that entire year asking corporate for something comparable to put on their own lots. The Demon was the answer: the same fastback A-body silhouette, redressed with Dodge grille work, taillamps, and trim. That shared engineering is why the two cars drive so similarly, why parts interchange so readily between them today, and why a Demon restoration is one of the better-supported projects in the Mopar world. It is also why the Demon has always lived slightly in the Duster’s shadow despite being the rarer of the two by a wide margin.

1971 Was the Last Year It Really Counted

Timing matters enormously to how this car is valued now. The 1971 model year was the last one before Chrysler dropped compression ratios across its engine range to run on lower-octane unleaded fuel and to meet tightening federal emissions standards, and the corporation switched from gross to net horsepower ratings for 1972. The same 340 that read 275 horsepower in 1971 was quoted at 240 net horsepower the following season, a figure that reflects both a genuine reduction in output and a change in how the number was measured in the first place. A 1971 Demon 340 therefore sits at the high-water mark of the entire package, which is precisely why the earlier cars carry a consistent premium over otherwise identical later ones.

The Production Numbers That Explain the Price

Rarity does the rest of the work. Dodge built only 10,098 Demon 340s for 1971, a figure dwarfed by the 69,861 base Demons and 102,480 Dart Swingers that left the factory the same year. Put another way, roughly one Demon in eight got the 340. Because the base cars share the body shell and most of the exterior trim, converting a six-cylinder Demon into a convincing 340 tribute has never been especially difficult, and the market has adjusted accordingly. Fender tag and broadcast sheet documentation now drives a meaningful share of what a car like this is actually worth, and a verified numbers-matching example can be worth multiples of a well-built clone sitting beside it at the same show.

What the Competition Was Asking

Context sharpens the value proposition considerably. A buyer shopping compact performance in 1971 could look at the Plymouth Duster 340, the Ford Maverick Grabber, the Chevrolet Nova SS 350, or AMC’s Hornet SC/360, and among that group the Mopar twins carried the strongest engine. The 340 out-revved the Nova’s base 350 and comfortably outran the Maverick’s 302. Meanwhile a big-block Charger R/T or a Hemi Challenger cost thousands more before the insurance company had even been consulted, and by 1971 insurers were surcharging young buyers straight out of big-block cars whether they liked it or not. The Demon was, in a very real sense, a muscle car that underwriting departments helped create.

What to Check Before You Buy One

Anyone shopping a surviving Demon 340 today learns the same lessons quickly. The A-body’s front frame rails, torsion bar crossmember, and rear spring hangers are the structural areas that rot first, and a car that looks arrow-straight in photographs can hide serious corrosion beneath fresh undercoating. The correct 340 carries specific casting numbers on the block and cylinder heads, and factory four-speed cars used a distinct floor pan and pedal assembly that is difficult to replicate convincingly. Nearly every cosmetic detail that made the car special, from the stripe treatments to the optional blackout hood to the devil emblems themselves, is reproduced today, which is exactly why paperwork now matters far more to value than trim does.

From Punchline to Prize

The joke stopped being a joke somewhere around the turn of the century. The Demon nameplate was retired after the 1972 model year and replaced by the considerably more polite Dart Sport, and for decades afterward the cars were cheap enough that plenty of them were raced, wrecked, or quietly parted out. Then Dodge revived the name in 2018 for a supercharged Challenger built around drag strip performance, and suddenly the original had a famous descendant and a story worth retelling. Well-documented 1971 Demon 340s wearing their original colors now trade for many multiples of their original sticker, and survivors like the pair pictured here are exactly what keeps the story circulating.

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