Chevrolet 153 4-cylinder engine

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 Turbo-Thrift six-cylinder engine. After 1970, GM ceased production of the 153 engine in North America because of low demand (and the inline-six was thereafter made the base engine in the Nova), but the engine continued to be used in cars in other markets around the world, notably in South Africa and South America. 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 (e.g. forklifts and generators) and marine applications. The 153 engine is entirely different from the 151 cu in (2.5 L) 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.

Chevrolet had previously manufactured an OHV inline-4 engine from 1913 until 1928, when it was replaced by the "Stovebolt Six."