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The Chevrolet straight-six engine was Chevrolet's sole engine from 1929 (when it replaced their 171-cubic-inch (2.8 L) inline-four) through 1954, and was the company's base engine starting in 1955 when they added the small block V8 to the lineup. It was completely phased out in North America by 1990; in Brazil, GM held on to their fuel-injected. Engine Casting Numbers Explained 1954-1962 Chevrolet The Casting Numbers to the right are found just below and to the right of the Distributor on the passenger side. They are notoriously very hard to read and often people make the mistake of thinking a '3' is an '8'.