Completly stupid, but it was solely a marketing campaign, in all actuality most, not all, but most engines have the same head design as dodges new "hemi", its actually a pentroof and looks like /\ with the valves in the sides, and is more efficient then the original hemis, because they couldnt figure out how to get more than a 2v in the dome, i just dont think they were thinking...but yeah, in a sense the new mustangs are hemis, hell the 03s are, camaros are...etc...