Most combustion chambers on american V8's are wedge style.
Hemi good port to valve angle. big valves, central spark plug(s), valves open away from cylinder walls no shrouding around valves.
Disadvantage large surface to volume ratio. No effective quench (true hemi)
High compression ratio requires a big piston dome. High surface to volume ratio. Convoluted combuston
chamber shape with big dome. More expensive to manufacture Complicated valve train, rocker system. Most Hemi's are not a true Hemi head . But a modified hemi Semi hemi with quench like the new chrysler Hemi.
engine of present.