How much horsepower does a 348 Chevy have?
The horsepower of the Chevrolet 348 V8 varies by year and configuration, but most versions produced about 250 horsepower in its standard form, with higher-performance setups reaching roughly 300 to 350 horsepower depending on tuning and carburetion.
Overview of horsepower ranges by configuration
Below is a snapshot of typical outputs across common 348 configurations and era-specific ratings. Numbers are approximate and depend on year, carburetion, and compression, as well as whether the rating used SAE gross or SAE net conventions of the time.
- Base 348 V8 with a single four-barrel carburetor: approximately 250 horsepower.
- Tri-Power variants (three two-barrel carburetors): commonly cited around 300 to 350 horsepower, depending on year and compression.
- Higher-performance 348 configurations with additional tuning or carburetion: generally in the mid-to-upper 300s horsepower, contingent on exact spec and rating method.
Notes: The exact figure for a specific car depends on model year, market, and how the factory rated power (SAE gross vs. net) was calculated. For precise numbers, consult the vehicle’s build sheet or period Chevrolet literature.
Understanding ratings and era context
Horsepower figures from the late 1950s and early 1960s were often reported using SAE gross standards, which can differ significantly from modern SAE net ratings. This can make direct comparisons with modern engines or different rating methods misleading. When researching a specific 348, identify the rating standard used in the documentation for an accurate comparison.
Summary
In essence, the Chevrolet 348 V8 ranged from about 250 horsepower in its standard form to approximately 300–350 horsepower in its higher-performance configurations, with the exact number depending on year, carburetion, and measurement method. For an exact figure on a particular engine, reference its build sheet or period factory specs.
Is the Chevy 348 a big block?
As introduced in 1958, the new "Turbo Thrust" 348 big-block was 1.7 inches longer and three inches wider than the 265 / 283. It was also said to be 0.80-inch lower due to a flat intake manifold.
What is the difference between a 348 and 409 engine?
The Chevrolet 409 is a larger, higher-performance version of the 348 W-series engine, with the 409 achieved through a larger bore and stroke. Both are W-series V8s with combustion chambers in the block, but the 409, introduced in 1961, was a stroked and bored-out version of the 348 that debuted in 1958 and is known for its higher horsepower and torque.
You can watch this video to learn about the 348 vs 409 engines and their history: 43sEpic MotorsYouTube · Aug 9, 2025
This video explains the evolution of the 348 engine into the 409 and its performance: 54sGMgalaxyYouTube · Apr 20, 2025
| Feature | 348 | 409 |
|---|---|---|
| Displacement | 348 cubic inches (5.7 L) | 409 cubic inches (6.7 L) |
| Bore | 4.125 inches | 4.3125 inches |
| Stroke | 3.25 inches | 3.5 inches |
| Debut | 1958 | 1961 |
| Performance | Lower horsepower and torque | Higher horsepower and torque |
| Key Characteristics | Early W-series V8 | A more powerful, larger displacement version of the 348 |
| Physical Difference | Dipstick on the left (driver's) side, according to some sources | Dipstick on the right (passenger's) side, according to some sources |
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How much horsepower does a 348 Chevy engine have?
250 @ 4800 RPM
Displacement: 348 cubic inches. Bore and stroke: 4.125 x 3.25 inches. Compression ratio: 9.5:1. Horsepower: 250 @ 4800 RPM.
Was the Chevy 348 a good engine?
Yes, the Chevy 348 was a good engine, particularly known for its strong torque, durable construction, and versatility. Originally designed as a smooth, torquey powerplant for trucks and larger cars, it provided excellent low-end and mid-range grunt. Its role as the foundation for the more famous 409 and its capability for performance upgrades made it a significant engine in Chevrolet's history.
Strengths
- Torque: The engine excelled at producing strong low-end torque, making it well-suited for heavy vehicles like trucks and large passenger cars.
- Durability: Built for the demanding work of trucks, the 348 featured a durable cast-iron block that could handle high compression ratios and other modifications.
- Versatility: It was available in various versions, from a base 250 hp model to high-output "Tri-Power" versions with three two-barrel carburetors that could produce up to 335 hp.
- Foundation for Performance: Although not initially intended as a high-performance engine, it was a capable platform for enthusiasts. It served as the basis for the legendary 409 engine and was a popular choice for performance builds.
Weaknesses
- Top-End Limitation: The hydraulic lifter versions were limited by valve float around 5400-5500 RPM, which restricted top-end power.
- Factory Shortcomings: The original factory heads had small ports and valves and pressed-in rocker studs, which limited performance without modification.
- Reputation: The engine developed a reputation as a "boat anchor" due to a common practice of over-revving, especially when combined with the limitations of early valve springs.
Legacy
The 348 played a crucial role in Chevrolet's history by introducing the "W" series big-block and laying the groundwork for future performance engines like the 409. Today, the 348 remains a popular engine for classic car builders, who often upgrade the heads and other components to create a powerful and reliable engine for a wide range of applications.
