Chevrolet 305 Engine Specs

The Chevrolet 305 is the 5.0-liter small-block V8 that served as one of GM's most common mainstream V8 engines from the mid-1970s into the 1990s. It was not the most glamorous member of the small-block family, but it played an important role in keeping V8 power available during an era shaped by emissions controls, fuel economy pressures, and changing market priorities.

Chevrolet developed the 305 as a smaller-displacement alternative to the 350 that could better satisfy emissions and economy targets while still fitting into the familiar small-block platform. It retained the cast-iron block and heads, OHV valvetrain, and broad parts compatibility that defined the family, but output varied widely depending on year and calibration. Across its long life, factory ratings ranged from roughly 130 to 230 HP, reflecting the very different priorities of late-1970s smog-era tuning and later fuel-injected performance versions.

In practice, the 305 became known as a dependable, affordable everyday V8 rather than a halo performance engine. It powered millions of GM cars and trucks and remains relevant because parts are easy to find, maintenance is straightforward, and many owners still appreciate the simplicity of a traditional small-block V8.