Chrysler A engine
The Chrysler A engine is a small-block V8 gasoline engine built by Chrysler with polyspherical combustion chambers. It was produced from 1956 until 1967, when it was replaced by the wedge-head LA engine. It is not related to the hemispherical-head Hemi engine of the same era.
Engine block
An engine where all the cylinders share a common block is called a monobloc engine. Most modern engines (including cars, trucks, buses and tractors) use a monoblock design of some type, therefore few modern engines have a separate block for each cylinder. This has led to the term "engine block" usually implying a monobloc design and the term monobloc itself is rarely used.