How much horsepower does a 1978 Dodge 318 have?
In general terms, the 1978 Dodge 318 V8 produced about 150 horsepower in the common two-barrel configuration, with higher-output four-barrel variants around 165–170 horsepower. Exact figures vary by model and equipment.
Context and rating standards
In 1978, horsepower figures were reported using the SAE net standard, reflecting output with standard emissions and accessories in place. The 5.2-liter 318 V8 was a mainstay of Dodge's lineup, used across passenger cars and light trucks, and tuning varied by model year, market (federal vs California), and carburetor setup.
Common configurations and approximate horsepower
Details vary by application, but the typical ranges you might encounter for the 318 in 1978 are summarized below.
- Base 2-barrel carbureted 318: about 150 hp (SAE net).
- 4-barrel carbureted 318 in higher-trim or sport-oriented configurations: roughly 165–170 hp (SAE net).
- Emissions-constrained or heavy-duty trucks and California-market variants: commonly around 140–150 hp.
Note: Exact numbers can differ by sub-model, transmission choice, exhaust setup, and any mid-year changes. The 318's appeal was its torque and durability rather than peak horsepower.
Model-by-model considerations
Dodge used the 318 across several models in 1978, including compact cars (like the Dart-based line) and mid-size sedans, plus light-duty trucks. Each configuration could influence the posted horsepower figure due to emissions requirements and equipment installed.
Passenger cars vs trucks
Passenger cars with the 318 typically aligned with the base ~150 hp rating, while trucks or California-spec engines could be lower due to stricter emissions controls or gearing that reduced peak output. Always check the vehicle's specific build sheet for confirmation.
Why horsepower matters in the late 1970s
During this era, automakers faced tightening emission controls and fuel economy standards. The 5.2-liter 318 remained valued for its torque and reliability, but horsepower ratings were often reduced relative to earlier decades to meet regulatory targets and real-world economy expectations.
Summary
The 1978 Dodge 318 V8 generally delivered around 150 horsepower in the common two-barrel setup, with higher-output four-barrel variants around 165–170 hp. Exact figures depend on the model, market, compression ratio, and carburetion. For precise numbers on a specific vehicle, consult the original build sheet or factory documentation.
