WRONG , if the valves don't oppose it aint a hemi ! look at the rat motors , called 'SEMI HEMI`S " , now the new ex prostock mopar motor had twisted valve lay out, copied off the chevy head , so they could put bigger valves in it .
If u limit the valve size to the biggest a real hemi can run, it cant be touched by anyones stuff, the canted valve engines can run bigger valves , therefore more h.p. .
