What are the pros and cons of valves being placed in a line vs valves being placed side by side in 2V engines?

Question

As you can see in the picture below the valves in this ferrari dino dohc 2 valves per cylinder v6 engine are placed side by side and not in a row. And as you can see here in the other picture below the valves of this pushrod 2 valves per cylinder engine are placed in line and not side by side. What are the pros and cons of both of those types of placement of the valves?

Pᴀᴜʟsᴛᴇʀ2 · Accepted Answer

Ferrari Example:
Pro

Angle of the valves give better flow into and out of the cylinder
Revs higher

Con

More complicated
Higher center of gravity
Less compact
Costs more to produce and fix

Chevrolet Example:
Pro

Less complicated
Single cam to run them all
Cheaper to produce and fix
More compact setup

Con

Angles of valve complicates flow paths (not as straight of flow to/from chamber)
Rev range limited

Mind you, these pros/cons have more to do with the entire valve train versus just the valve placement themselves.

What are the pros and cons of valves being placed in a line vs valves being placed side by side in 2V engines?

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