The early Hemi engine was produced by Chrysler in 1951 and gets the name from the hemispherical cylinder head, making these engines more powerful and more efficient. The first series of early Hemi engines produced by Chrysler appeared from 1951 to 1958, and a second series was made from 1964 to 1971.

The initial production of the early Hemi engine was done during World War II for the P-47 Thunderbolt fighting airplane.

In 1950, Chrysler then applied this early Hemi engine technology to its first overhead valve V8 engine, marketed under the name ‘FirePower’. These early Hemi engines are commonly known as first-generation Hemi engines.

DeSoto introduced their version of an early Hemi engine in 1952, called the ‘Fire Dome’. in 1953, Dodge introduced their version of an early Hemi engine, calling it the ‘Red Ram’. The second generation of early Hemi engines appeared in 1964 and were produced again by Chrysler.

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