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As Tim Ayers suggested, if you want a perspective of the "hemi" engine concept, read the book he suggested, The Golden Age of the American Racing Car. Ettore Buggatti purchased 2 American race cars somewhere back in the early 20's, and copied the hemi engine head design. The shop that did my 59L had a 1923 Buggati engine in the shop with the Offy type integral block & head, which was a hemi design.