10/20/2026
Chevrolet gave one engine two names.
The name depended on the body around it.
One name outlived the other by years.
The small-block engine could not meet the demands of the models set to hit the market in 1958. The new body styles were heavier, and the pickup truck lineup needed more power than the existing engine could provide. Chevrolet designed a single engine for both purposes, named the engine family “W,” and introduced its first version with a displacement of 348 cubic inches.
In passenger cars, this engine was called the Turbo-Thrust. It produced 250 horsepower with a single 4-barrel carburetor. The Super Turbo-Thrust, on the other hand, produced 280 horsepower with three 2-barrel carburetors. The most powerful version reached 315 horsepower with solid lifters and an 11:1 compression ratio. Chevrolet offered this version exclusively with a manual transmission.
In trucks, the same engine was called the Workmaster. Same block, same bore, different emblem, and a different target audience.
It was used in passenger cars through 1961. In heavy-duty trucks, it remained in use through 1964. The iron under this black hood was still earning its keep 3 model years after passenger cars had moved on.
Black on black with blue vinyl.
Tri-Power on the 348.
A 3-speed transmission with the shifter extending from the steering column.
Despite having 76,103 miles on the odometer, it still shifts into third gear effortlessly.
The most beautiful car on the lot shared its engine architecture with Chevrolet’s commercial fleet.
The 348 W engine tells an interesting story about Chevrolet’s approach to performance in the late 1950s. Its most powerful passenger-car version combined three 2-barrel carburetors, solid lifters, and a high compression ratio to deliver serious performance. Yet the same engine family also powered heavy-duty trucks, proving its versatility beyond passenger cars.
The Tri-Power setup and column-shift 3-speed transmission give this Chevrolet a distinctive character. Its black finish and period-style controls preserve its connection to the era, while the engine tells a broader story about Chevrolet engineering. Before muscle cars took over the market, the 348 W engine served both performance-minded drivers and commercial operators.