Editing Chevrolet big-block engine (section)

===348===
The first iteration of the W-series engine was the 1958 "Turbo-Thrust" {{convert|348|CID|L|1|adj=on}}, originally intended for use in Chevrolet trucks but also introduced in the larger, heavier 1958 passenger car line. Bore and stroke was {{cvt|4+1/8|x|3+1/4|in|mm|1}}, resulting in a substantially [[oversquare]] design. This engine was superseded by the {{cvt|409|cuin|L|1}} as Chevrolet's top performing engine in 1961 and went out of production for cars at the end of that year. It was produced through 1964 for use in large Chevrolet trucks.

[[File:348 W Block.jpg|thumb|1958 348 4-barrel engine]]

With a four-barrel [[carburetor]], the base Turbo-Thrust produced {{cvt|250|hp|kW|0}}. A special "[[Tri power]]" triple-two-barrel version, called the "Super Turbo-Thrust", produced {{cvt|280|hp|kW|0}}. A "Special Turbo-Thrust" upped the power output to {{cvt|305|hp|kW|0}} with a single large four-barrel carburetor. Mechanical lifters and Tri power brought the "Special Super Turbo-Thrust" up to {{cvt|315|hp|kW|0}}. For 1959 and 1960, high-output versions of the top two engines were produced with {{cvt|320|hp|kW|0}} and {{cvt|335|hp|kW|0}} respectively. In 1961, power was again increased to {{cvt|340|hp|kW|0}} for the single four-barrel model, and {{cvt|338|hp|kW|0}} when equipped with Tri power.

{| class="wikitable"  style="float:center;"
|+Versions
!First Year
!Last Year
!Model Name
!Features
!Power (Advertised [[Horsepower#SAE gross power|Gross]])
|-
|rowspan="4"|1958||rowspan="3"|1961||Turbo-Thrust||4 barrel||{{cvt|250|hp|0}}
|-
|Super Turbo-Thrust|| 3x2 barrel||{{cvt|280|hp|0}}
|-
|Special Turbo-Thrust||4 barrel||{{cvt|305|hp|0}}
|-
|rowspan="2"|1960||Special Super Turbo-Thrust|| 3x2 barrel||{{cvt|315|hp|0}}
|-
|rowspan="2"|1959||Special Turbo-Thrust||4 barrel||{{cvt|320|hp|0}}
|-
|rowspan="3"|1961||Special Super Turbo-Thrust|| 3x2 barrel||{{cvt|335|hp|0}}
|-
|rowspan="2"|1960||Special Turbo-Thrust||4 barrel||{{cvt|340|hp|0}}
|-
|Special Super Turbo-Thrust|| 3x2 barrel||{{cvt|348|hp|0}}
|}