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The Dodge Demon 340 is a two-year A-body muscle car, introduced for 1971 as Dodge’s counterpart to the Plymouth Duster. Its compact size and V8 performance explain the appeal, but “affordable” is not a reliable description of today’s market without a date and condition qualifier. The key year-to-year difference is the 340’s published rating: Dodge lists 275 hp for 1971 and 240 hp for 1972, alongside changes to the later engine’s compression and cylinder heads.
What is the Dodge Demon 340?
Dodge introduced the Demon for the 1971 model year. It shared the Plymouth Duster’s basic shell but received Dodge-specific front-end styling and revised rear lamps. The Demon 340 paired that compact A-body with a 340-cubic-inch V8, making it a distinct performance version rather than simply a trim name for every Demon.
Dodge’s history article cites a $2,721 base price for the 1971 Demon. That figure is for the base model; it does not establish the as-equipped price of a Demon 340. The period advertising line quoted by Dodge was, “Come in for a Demon-stration ride—just for the devil of it.”
1971 vs. 1972 Demon 340 specifications
Dodge’s historical account gives these differences. Its excerpt does not state the horsepower rating convention, so the figures should not be compared directly with modern net-horsepower ratings.
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| Specification | 1971 Demon 340 | 1972 Demon 340 |
|---|---|---|
| Engine | 340-cubic-inch V8 | 340-cubic-inch V8 |
| Published horsepower | 275 hp (Dodge history) | 240 hp (Dodge history) |
| Compression and heads | Not stated in the cited Dodge history excerpt | 8.5:1 compression; 360 heads with smaller intake valves (Dodge history) |
| Standard equipment noted by Dodge | Rallye suspension, dual exhaust, 14 x 5.5J wheels, E70 x 14 tires | Not stated in the cited Dodge history excerpt |
| Exterior year differences | 1971-specific grille, lamps, emblems, and side markers | Grille, lamps, emblems, and side markers changed for 1972 |
| Ignition availability | Not stated in the cited Dodge history excerpt | Not stated in the cited Dodge history excerpt |
These are not interchangeable restoration years: the visible trim and engine details differ. Dodge’s account establishes that the 1972 engine had reduced compression and smaller intake valves in 360 heads, but it does not provide enough detail here to infer every component or production configuration. Verify a particular car against year-specific documentation.
How quick was a stock Demon 340?
Dodge reports that Car Craft Magazine tested a stock 1971 Demon 340 with a four-speed manual transmission and 3.91 gearing in April 1971. The reported quarter-mile result was 14.41 seconds at 98.69 mph. The same Dodge account also mentions faster runs after modifications; those modified results are not stock-car figures and should not be conflated with the magazine test.
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What is a 1971 or 1972 Dodge Demon 340 worth?
There is no defensible current price range in the cited evidence. A Hagerty Marketplace listing reports that one 1972 Demon 340 sold for $35,043 on July 24, 2025. That is a single seller-submitted auction example, not a market average or a promise of what another car will bring. Hagerty’s valuation tool provides condition-based estimates, but its displayed figures are time-sensitive; check the tool directly rather than treating a value as permanent.
For an individual car, assess the factors that separate one example from another:
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- Condition: body, structure, interior, and mechanical state affect the work and expense ahead.
- Originality and identification: seek documentation supporting the claimed year, engine, and configuration, including numbers-matching claims where relevant.
- Restoration quality and provenance: inspect the quality of completed work and any records that support the car’s history.
- Transmission and axle setup: record what is fitted; the period performance test, for example, concerned a four-speed car with 3.91 gearing.
Because the available sale evidence is one auction result, it cannot establish that the Demon 340 is currently affordable or define a typical sale price.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What to check when buying or restoring one
Confirm the model year and configuration
Start with the vehicle’s documentation and inspect the car’s details rather than relying on a badge or seller description alone. The 1971 and 1972 cars differ in exterior details, and Dodge describes a specific 1972 engine configuration. Confirm the engine, trim, transmission, and other equipment against the car’s records and the parts you intend to buy.
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Match replacement parts to the car
Classic Industries lists a dedicated 1971–1972 Dodge Demon parts catalog. A model-specific catalog is a useful starting point, not proof that a particular item is in stock or fits every Demon. Check the listing against model year, engine, trim, and vehicle configuration before ordering.
Use period performance claims carefully
The documented 14.41-second quarter-mile pass applies to a stock four-speed 1971 car with 3.91 gearing. Different gearing, transmission, condition, or modifications make a direct comparison unreliable. Treat modified runs as modified, not as evidence of the stock model’s performance.
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Sources and further reference
- Dodge: 1971 Dodge Demon – Muscle Car History & 340 V8 Power — model history, specifications, equipment, and the period test as reported by Dodge.
- Hagerty Marketplace: 1972 Dodge Demon 340 — one sale reported July 24, 2025.
- Hagerty Valuation Tools: 1972 Dodge Dart Demon 340 — time-sensitive, condition-based valuation tool.
- Classic Industries: 1971–1972 Dodge Demon Parts and Accessories — model-specific catalog landing page.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
