The Chrysler HEMI is one of the most well-known, celebrated, and versatile engine series to come out of Detroit. Following WWII, Chrysler revived the hemispherical combustion chamber engine for automotive use after they fell out of fashion due to increased production costs. Hemispherical combustion chamber engines use half-sphere-shaped combustion chambers and unique pistons, which gave them an airflow advantage over early flathead engines since they can use larger intake and exhaust valves. Hemispherical engines also had better combustion efficiency, allowed
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