The Polyspheric Head Explained To address the cost, complexity, and weight issues that were hallmarks of the Hemi design, Chrysler substituted a polyspherical-shaped combustion chamber, with valves activated by a single rocker shaft. The shaft was centered between the valves and actuated intakes...
![Dodge Polyspheric Head Engines 1955 thru 1958](https://autohistorypreservationsociety.org/wp-content/uploads/1950s-Dodge-Poly-Head-Engines-Image-6.jpg)
Dodge Polyspheric Head Engines 1955 thru 1958
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