How much horsepower does a 340 Dodge engine have?
The Dodge 340 small-block V8, produced from 1967 through 1971, typically delivered about 275 horsepower in its standard form, with the high‑performance Six-Pack variant rated around 290 horsepower. In the emissions-era early 1970s, net horsepower ratings were lower, so exact numbers depend on year, configuration, and the rating method used.
Overview of the 340 engine family
The 340 cubic inch (5.6 L) V8 was part of Chrysler’s LA engine lineup and powered a variety of Dodge muscle cars and compact performance models, including the Dart, Barracuda, and Challenger. It emphasized strong mid-range torque for its size and remained a popular choice among enthusiasts for street and drag-orientated builds.
Horsepower by variant and era
Before listing the typical factory figures, note that horsepower varied by carburation setup and year. The numbers below reflect widely cited factory ratings from the era, using the gross horsepower standard common before the 1970s—and real-world performance can differ based on condition and tuning.
- Standard 340 with a single 4-barrel carburetor (most common configuration): about 275 horsepower gross in 1967–1969.
- 340 Six-Pack variant (three two-barrel carburetors) used in several high-performance Mopar models: typically about 290 horsepower gross, around 1968–1969 (and offered in some 1970 configurations as well).
- Contemporary 340s in 1970–1971 with 4-barrel carburetors generally continued around 275 horsepower gross; Six-Pack versions remained around 290 horsepower gross in compatible packages.
In actual use, published horsepower ratings are crankshaft figures (gross), while modern discussions often refer to lower net values after emissions and accessory losses. Engines of the same displacement can also differ based on compression, cam, exhaust, and intake tuning.
Notes on rating methods
Two main rating systems affected how horsepower is reported. Gross horsepower (used in the late 1960s) measures engine output without accessories, exhaust restrictions, or driveline losses, usually resulting in higher numbers. Net horsepower (adopted more broadly in the early 1970s) accounts for these losses, yielding lower figures. Therefore, a 275 hp gross figure from 1967 may translate to roughly 200–250 hp in net terms, depending on the car and configuration.
Six-Pack details
The Six-Pack setup comprises three two-barrel carburetors and was Mopar’s standout high-performance option for the 340. It reliably carried a higher gross rating of about 290 horsepower, making it the peak performer among the standard 340 configurations for its era. Availability and exact numbers varied by model year and package.
Summary: For most Dodge 340s, factory horsepower sits around 275 hp in standard form, with the notable Six-Pack variant at about 290 hp gross. Net horsepower in the emissions era was lower, and precise figures depend on the specific year, model, and rating method. If you need the exact figure for a given car, consult the original build sheet, brochure, or Chrysler literature from that model year.
How much HP can a 340 make?
A Mopar 340 engine's horsepower varies by model year and configuration, with the 1970s version typically rated at 275 horsepower (gross), while later versions saw a slight decrease in ratings due to detuning. A more powerful "Six-Pack" version, featuring three two-barrel carburetors, made 290 horsepower, and a 2022 BMW 340i has 382 horsepower.
Mopar 340 engine
- 1970-1971: Stock rating was 275 horsepower (gross) at 5,000 rpm.
- 1972: Ratings dropped to 240 horsepower (net).
- "Six-Pack" version: The most powerful version with triple carburetors produced 290 horsepower.
- Dyno results: A stock 1970 engine dynoed at 281.3 hp, which is close to the factory rating.
- Detuning: The 340 was detuned in later years due to emissions regulations, which is why its gross horsepower rating dropped from 275 hp to 240 hp net.
Other 340 engines
- 2022 BMW 340i: Has a 3.0-liter turbocharged inline-6 engine that makes 382 horsepower.
How much is a 340 engine worth?
The value of a 340 engine varies significantly, from scrap value ($150-$400) to a few thousand dollars for a used or high-performance model, and up to $5,000−$8,000$ 5 comma 000 minus $ 8 comma 000$5,000−$8,000 for a brand-new crate engine. The condition, whether it's a used original or a new crate engine, and its specific features determine its final price.
Value by engine condition and type
- Scrap value: An old or broken engine typically sells for scrap at a rate of about $150−$400$ 150 minus $ 400$150−$400, similar to other engines of its size.
- Used engines: A used, running 340 engine could be found for under $1,000$ 1 comma 000$1,000, though prices vary widely based on condition and included components.
- Crate engines: A brand-new, rebuilt Mopar 340 crate engine often costs between $5,000$ 5 comma 000$5,000 and $8,000$ 8 comma 000$8,000, not including additional costs for accessories or installation.
- New V8 engines: More generally, brand-new V8 engines can cost anywhere from $2,000$ 2 comma 000$2,000 to over $10,000$ 10 comma 000$10,000, depending on the specifications and the vehicle they are designed for.
Factors that influence the price
- Condition: A used engine's condition is a primary factor, with a fully functional engine being worth more than one needing a rebuild.
- Originality: Original engines from a specific classic era can be worth more to collectors.
- Crate engines: New crate engines are often more expensive due to the cost of re-manufacturing, new parts, and warranty.
- Accessories: The price of any engine will increase if it comes with additional accessories like a carburetor, intake manifold, or other performance parts.
- Labor: The cost of installation and any necessary modifications is a separate and significant expense, often not included in the engine's base price.
What is the difference between 383 and 340?
A major difference between the 383 and 340 was their intent. While the 383 Big Block V8 was meant for raw performance, the 340 Small Block V8 was designed to be lightweight and efficient.
How much horsepower does a 1970 340 six pack have?
290 horsepower
Factory Numbers and Real-World Power Officially rated at 290 horsepower and 345 lb-ft of torque, the consensus among enthusiasts was that the Six Pack 340 actually produced closer to 330 horsepower.
