Rusty O\'Toole wrote:
The Polysphere was more like a Hemi head than a wedge head. Chrysler brought out their first Hemi V8 for the New Yorker, Imperial and Saratoga in 1951 while keeping the flathead 6 for the Windsor. In 1954 they introduced a new V8 for the Windsor which they called a Polysphere V8..
The big block Chev featured what they called a "canted valve" head. It has the valves at an angle and a flattened out Hemi head like a Poly.
Only Chev brought out their engine just as Chrysler was dropping the Poly head, 1965 - 66.
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