When was the HEMI engine made?

The Hemi engine's history spans several eras, with different iterations appearing at different times. There's no single answer to "when it was made".

* Original Hemi (1951): Chrysler introduced the first hemispherical combustion chamber engine in 1951, a design that gave the engine its name.

* Later iterations: Chrysler and other manufacturers have produced Hemi engines in various forms throughout the years, with significant redesigns and production runs in later decades (like the 426 Hemi in the 1960s and the modern Hemi introduced in 2003).

So, to be precise, you need to specify *which* Hemi engine you're referring to.