...really? what was it?
from wiki: Eight cylinder[edit] Inline 8[edit]Inline 8 cylinder - Chrysler's early flathead inline 8-cylinder 5.3 L engine used on cars such as Airflows, DeSotos and Imperials. With side valves and aluminium pistons, this was a low-rpm engine that produced about 120 hp (89 kW). V8[edit]
FirePower - Chrysler's first V8 and first hemi engine, introduced in 1951 for Chrysler and Imperial. DeSoto and Dodge each received their own, unique smaller hemi line of engines in 1952 and 1953, called the FireDome and Red Ram,respectively . These engines, taken together, are now referred to as "1G" (1st generation) hemis, all have rear-mounted distributors.
Polyspheric - A polyspheric design introduced in 1955, derived from the FirePower for Plymouth.