The Chevrolet 153 cu in engine was an inline-four engine designed in the early 1960s for use in the Chevy II. It is a four-cylinder variant of the. After 1970 GM ceased production of the 153 engine in North America because of low demand, but the engine continued to be used in cars in other markets around the world, notably South Africa and Brazil. The engine was also standard equipment in the Jeep DJ-5A—used by the United States Postal Service—until American Motors bought Kaiser Jeep in 1970 and replaced the engine with the AMC straight-six in the DJ-5B. Currently descendants of the 153 engine are used in industrial and marine applications. The 153 engine is entirely different from the Iron Duke engine introduced by Pontiac in 1977, most noticeably never having featured the Pontiac engine's crossflow cylinder head, but the two are often confused today.
History
The compact Chevrolet Corvair was introduced in 1960 to compete with the Ford Falcon and Plymouth Valiant, but was handily outsold by its competitors. Fearing the Corvair's more radical engineering was not appealing to consumers GM hastily approved the design of a new, more conventional compact car to compete with the Falcon and Valiant. Within 18 months the design of the Chevy II was completed, including new four-cylinder and six-cylinder engines to power it. The 153 cu in engine had a bore and stroke, with two overhead valves per cylinder actuated by pushrods and a 1-3-4-2 firing order. The Chevy II's 194 cu in six-cylinder used a bore, which by 1964 was enlarged to match the 153 four-cylinder's resulting in a displacement of. The 230 cu in six and 153 cu in four are thus essentially the same design, differing only in cylinder count.
Brazil
The 153 engine was used by GM do Brasil in their first locally-made product, the 1968 Chevrolet Opala. In 1973 the Brazilian engineers redesigned the engine in order to quell vibrations, decreasing the stroke to and increasing the connecting rod lengths to. To keep the power output similar to the 153 they correspondingly increased the bore to, resulting in displacement. This 2,471 cc variant of the engine was in production in the Opala until 1992. Coincidentally the bore and stroke are the exact same as the Pontiac Iron Duke engine introduced in North America in 1977, but the two engines are otherwise unrelated and do not share parts. As is customary in Brazil the engine was refit to accept ethanol fuel.
South Africa
This engine was a mainstay for GMSA, who built it in their Aloes Plant for installation in a wide range of cars. Two smaller displacement versions of this engine were also built there: a variant using the 153's bore and the Brazilian 151 cu in engine's stroke, and a variant which used the 153's stroke and the 194 cu in six-cylinder's bore. The engine was also used by the SADF in the Eland armoured car from the Mk. 5 upgrade.
GM produced a variant of the 153 for use in industrial and marine applications, with the Brazilian version's larger bore and a longer stroke. The resulting engine, branded the Vortec 3000, was never installed in passenger cars. Later variants of the Vortec 3000 had modified cylinder heads where machined bosses were drilled for use with multipoint fuel injection.
