In gearhead terminology, the word hemi refers to the generally hemispherical shape of an engine’s cylinder head combustion chamber. In the truest sense of the word, no automobile engine actually has a fully hemispherical combustion chamber. However, according to the looser hemi definition, the Ford Boss 429 engine is considered a hemi design. Of course, Chrysler devoted years of research and untold dollars towards perfecting its 426 Hemi V8 for use in NASCAR, as well as a version designed for
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