How much horsepower does a 1978 L82 have?
The L82 in 1978 produced about 230 horsepower, as measured by SAE net ratings used at the time. This article explains what that means, how the rating was determined in 1978, and how to interpret it for cars that wore the L82 badge.
In the late 1970s, horsepower figures were shaped by new testing standards and federal emissions rules. The L82 was Chevrolet’s high-performance 5.7-liter V8 option, most notably associated with performance-oriented GM models of that era. Understanding the number requires looking at rating methods as well as model-specific tuning and exhaust configurations.
What the L82 was in 1978
The L82 designation referred to Chevrolet’s performance-oriented 5.7L V8 available on select models that year. By 1978, GM used SAE net horsepower ratings, which account for accessories, the exhaust system, and emissions equipment as installed in production cars. Under those ratings, the L82 is commonly listed at around 230 horsepower for the 1978 model year.
Why the number can vary
While 230 hp is the widely cited figure, some sources show 225–230 hp for the L82 in 1978, reflecting small differences in testing, factory calibration, exhaust configurations, and whether a particular vehicle was equipped with features that affected airflow or emissions. The same engine could show slightly different numbers depending on the model and production year specifics.
Here are the key points that influence how the 1978 L82 horsepower is reported:
- SAE Net horsepower vs older gross horsepower ratings; net ratings include real-world drivetrain losses and emissions equipment.
- Federal emissions controls that were in place by 1978, which typically reduced peak output compared with earlier, pre-emissions setups.
- Model-specific tuning and exhaust configurations that could introduce minor variations in published figures.
- Vehicle variations and testing methods across different GM models using the L82, such as Corvette versus other high-performance lines.
In summary, the 1978 L82 is commonly cited at approximately 230 horsepower under SAE net ratings, with occasional listings in the mid-220s reflecting minor production and measurement differences.
Summary
How much horsepower does a 1978 L82 Corvette have?
The 1978 Corvette L82 engine produced 220 horsepower at 5200 rpm and 260 lb-ft of torque at 3600 rpm. This was a higher-performance option compared to the base L48 engine, which produced 185 horsepower.
- Horsepower: 220 hp
- Torque: 260 lb-ft
- RPM: 5200 rpm (for horsepower)
- Compression Ratio: 8.9:1
What is the top speed of the L82 Corvette?
The 1976 Corvette with the L82 engine could accelerate from 0 to 60 mph in around 6 seconds, and it had a top speed of over 120 mph. .
How much is an 82 Corvette worth today?
The value of a 1982 Corvette ranges from approximately $13,500 for a low-end model to over $41,995 for a high-end model, with an average price of around $22,378. The specific value is highly dependent on the car's condition, mileage, and whether it is the rare and more valuable Collector Edition.
1982 Corvette value by condition
- Low retail: Approximately $13,500
- Average retail: Around $22,378
- High retail: Over $41,995
Factors that influence value
- Condition: A car in excellent, original condition will command a much higher price. Poor condition or significant maintenance needs will lower the value.
- Mileage: Lower mileage generally means a higher value.
- Collector's Edition: The 1982 Collector Edition is a more valuable model, with its value influenced by the same factors as other models.
- One-year-only features: The 1982 model year has several unique features, such as the L83 engine with crossfire injection, a one-year-only blue interior color, and the Silver Green Metallic paint, which can increase its desirability and value.
How much horsepower did a 1978 Z28 have?
The Z28 models included a stripe package that was not deletable and featured the LM1 a 350 cu in (5.7 L) V8 with a four-barrel Quadrajet carburetor that produced 185 hp (138 kW; 188 PS) and 280 lb⋅ft (380 N⋅m) of torque, coupled to either a 4-speed manual or a TH-350 3-speed automatic.
