Chevrolet Small-Block V8 Engine Specs

The Chevrolet Small-Block V8 is one of the most important and longest-running American engine families ever built. Introduced in 1955, it became the mechanical foundation for countless Chevrolet passenger cars, trucks, and performance models for nearly five decades. Its compact dimensions, simple pushrod layout, low production cost, and huge tuning potential turned it into a defining engine family of the American automotive industry.

Chevrolet developed the small-block to create a lighter, more efficient, and more modern V8 than the older stovebolt-era designs it replaced. Over time, the family grew through many displacements and factory versions, from the early 265 and 283 to famous later variants such as the 327, 350, and 400. Although power, compression ratio, induction, and intended use changed from one version to another, the core formula stayed familiar - a compact 90-degree OHV V8 with two valves per cylinder and broad parts interchangeability across generations.

In real-world use, the Chevrolet small-block earned its reputation by doing almost everything well enough to matter. It powered sedans, pickups, muscle cars, Corvettes, race builds, and engine swaps, and it remained popular because it was easy to service, easy to modify, and supported by an unmatched parts ecosystem. Even decades after many original versions left production, the traditional small-block remains one of the most influential V8 platforms ever created.

The term Chevrolet Small-Block V8 refers to the classic first-generation family produced from 1955 through 2003, not to one exact displacement or specification. That is why the family includes many different versions such as the 265, 283, 302, 305, 307, 327, 350, and 400. These engines share the same basic design philosophy, but their output, character, and applications can differ substantially depending on year and version.