for use in Chevrolet trucks but also introduced in the larger, heavier 1958 passenger car line. Bore and stroke was , resulting in a substantially oversquare design. This engine was superseded by the as Chevrolet's top performing engine in 1961 and went out of production for cars at the end of that year.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. With a four-barrel carburetor, the base Turbo-Thrust produced . A special "Tri power" triple-two-barrel version, called the "Super Turbo-Thrust", produced . A "Special Turbo-Thrust" further upped the power output to with a single large four-barrel carburetor. Mechanical lifters and triple two-barrel carburetors brought the "Special Super Turbo-Thrust" up to . For 1959 and 1960, high-output versions of the top two engines were produced with and respectively. In 1961, power was again increased to for the single four-barrel model, and when equipped with triple two-barrels. 409 A version was Chevrolet's top regular production engine from 1961 to 1965, with a choice of single or 2X4-barrel Rochester carburetors. Bore x stroke were both up from the to . On December 17, 1960, the 409 engine was announced along with the Impala SS (Super Sport) model. The initial version of the engine produced with a single 4-barrel Carter AFB carburetor. The same engine was upped to in 1962. A version of this engine was also available, developing 1 hp per cubic inch with a dual four-barrel aluminium intake manifold and two Carter AFB carburetors. It had a forged steel crankshaft. This dual-quad version was immortalized in the Beach Boys song titled "409". In the 1963 model year, output reached @ 6000 rpm and @ 4200 rpm of torque with the Rochester 2X4-barrel carburetor setup, a compression ratio of 11:1 and a solid lifter camshaft. The engine was available through mid-1965, when it was replaced by the Mark IV big-block engine. In addition, a version of the 409 engine was available from 1963 to 1965, with a single 4-barrel cast iron intake mounting a Rochester 4GC square-bore carburetor, and a hydraulic-lifter camshaft. 427 (Z11) A special version of the 409 engine was used in the 1963 Impala Sport Coupé, ordered under Chevrolet Regular Production Option (RPO) Z11. This was a special package created for drag racers, as well as NASCAR, and it consisted of a engine with aluminium body parts, and a cowl-induction air intake system. The aluminium body parts