What engine is in 1955 Chevy 3100?
The 1955 Chevrolet 3100 could be equipped with either the 235 cubic inch inline-six or the 265 cubic inch small-block V8, with the V8 offered as an option on the half-ton pickup.
In 1955, Chevrolet introduced a major update to its trucks as part of the Task Force redesign. That year’s 3100 line offered two distinct powertrains under the hood: the enduring inline-six known as the Stovebolt 235 and Chevrolet’s brand-new small‑block V8, the 265, which marked a significant shift toward higher performance and smoother operation for light-duty trucks.
Powertrain options in 1955
Below are the two engine choices that could be found under the hood of a 1955 3100.
- Inline-six engine: 235 cubic inches, Chevrolet’s reliable Stovebolt Six. This engine was the established workhorse for trucks and offered straightforward maintenance and respectable low-end torque for a mid‑1950s pickup.
- Small-block V8 engine: 265 cubic inches, Chevrolet’s inaugural small‑block V8 introduced in 1955. This engine represented a major performance upgrade for the 3100 and shared in the broader Chevrolet lineup’s push toward more power and smoother operation; it was typically paired with a standard manual transmission.
These two options illustrate Chevrolet’s strategy in 1955: keep the dependable six for buyers who valued simplicity and economy, while offering the newer V8 for those seeking more power and modern acceleration in a lightweight pickup.
Identifying the engine in a 1955 3100
To determine which engine your 1955 3100 has, check the engine block’s stamping and the vehicle’s data plate. The 235 inline-six bears displacement markings near the engine, while the 265 V8 will show 265 on the block. A VIN/data plate on the firewall or door jamb can also help confirm the factory-installed engine option.
Restoration and parts availability follow the same pattern: the inline-six is widely supported by vintage Chevrolet trucks, and the 265 small-block has become a focal point for restorations aiming to recapture early V8-era performance in a 1955 pickup.
What this meant for buyers and enthusiasts
The dual-engine approach for the 1955 3100 gave buyers a clear choice between proven, economical operation and a new, more powerful powertrain. For collectors, the presence of the 265 V8 option is a notable milestone in Chevrolet’s transition to the small-block era, and finding a 3100 equipped with the V8 is often a highlight of a restoration project.
Summary
In 1955, the Chevrolet 3100 offered two distinct powertrains: the durable 235 cubic inch inline-six and the innovative 265 cubic inch small-block V8. This combination reflected Chevrolet’s broader shift toward modern V8 power while preserving the reliable six for practical buyers. Whether you’re restoring or researching, knowing which engine your 3100 has helps date the truck, determine parts compatibility, and understand how it performed in its era.
What engine came in a 1955 Chevy truck?
The standard engine was a 235 cubic inch (3.9L) inline-six, but for those looking for more power, an optional V8 engine (265 cubic inches) became available in late 1955, marking a significant upgrade from earlier models. Transmission: Most were equipped with a 3-speed manual transmission.
What size engine is in the Chevy 3100?
1952 Chevrolet 3100 Half Ton Specifications
The 1952 Chevy trucks featured a Thriftmaster 216.5-cubic inch in-line, six-cylinder, valve-in-head engine. The 216.5-cubic inch motor had a bore and stroke of 3.5 by 3.75 inches with a compression ratio of 6.5:1. It generated 90 horsepower at 3,400 rpm.
How much is a 1955 Chevy 3100 worth?
Typically, you can expect to pay around $30,300 for a 1955 Chevrolet Series 3100 1/2 Ton in good condition with average spec.
How much horsepower does a 1955 Chevy 3100 have?
145 horsepower
Introduced in mid-model year, the new design for the 1955 Chevrolet Series 3100 pickup was revolutionary from the cab forward. Inspired by passenger-car design, it had a wraparound windshield and eggcrate grille, and offered the option of Chevrolet's new 265-cubic-inch V-8, rated 145 horsepower under truck hoods.
