What engine was in a 1955 Chevy?
The 1955 Chevrolet was powered by two main engines: Chevrolet’s new 265-cubic-inch small-block V8 and the existing 235.5-cubic-inch inline-six known as the Stovebolt Six.
These two options defined Chevrolet's lineup for the year, with the V8 introducing a major performance upgrade that would shape the brand for decades.
The birth of the small-block V8
In 1955, Chevrolet unveiled the 265-cubic-inch small-block V8, a compact, light, and relatively affordable powerplant that redefined American mass-market performance. Designed by a team led by Ed Cole, the new V8 fit more efficiently into the engine bay than the larger inline six that had powered Chevrolets for years.
Why it mattered
The 265 V8 brought smoother, more robust performance to Chevrolets such as the Bel Air, 210, and 150, while preserving the classic Chevrolet drivability. The small-block’s modular design made it easier to produce and service, helping Chevrolet leverage higher horsepower without a dramatic weight penalty.
Two engine families in 1955
Chevrolet offered two main powertrain families across its 1955 models. The following list highlights the core configurations customers could choose from in Bel Air, 150, and 210 models.
- 235.5 cubic-inch inline-six (Stovebolt Six) with multiple carburetion options, used in lower-trim and standard models, delivering mid-range torque and durable everyday performance.
- 265 cubic-inch small-block V8 — introduced as the headline upgrade for 1955, available with two- or four-barrel carburetion, delivering a notable boost in power and smoothness compared with the six.
In summary, the engine options defined the 1955 Chevrolet's performance landscape. The inline-six offered dependable, economical power, while the new 265-cubic-inch small-block V8 provided a dramatic upgrade in torque, acceleration, and overall driving feel.
Summary
Chevrolet’s 1955 engine lineup centered on two paths: the familiar 235.5 cu in inline-six, and the groundbreaking 265 cu in small-block V8 that ushered in a new era of performance and efficiency for the brand.
