Both are SOLD Hudson Power Dome Aluminum Cylinder Heads, 6 & 8 Flathead Something different and unusual here. A straight 6 Aluminum cylinder head SUPER POWER DOME 202. A straight 8 Aluminum cylinder head POWER DOME. Marked with Alcoa Aluminum. There is no corrosion around the cooling passages and I see no evidence of cracks or deformation. Spark plug threads are good. Pretty sure these were an optional power enhancement option offered by Hudson. I decided against cleaning them up because many folks want that patina look. Would like to get $150 for the pair. Have to be worth that as wall hanger conversation pieces.