All intake manifolds attach to the side of the head or heads. They carry air, sometimes compressed, sometimes laden with fuel vapor, to the heads intake ports. The bottom rounded vee part of the intake manifold is the valley pan sealing the top of the vee on a V-8 engine.
The other side of the head is for exhausting the stuff that kills babies and kittens.
The top of the head is reserved for valves and the shit to open/close them, in an overhead valve engine. The exotic layout of the valves and open/close shit, is the reason for that second picture.
The two pictures are not related, now get off my lawn ya whippersnapper.
