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? 
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1Any 2 valves in a cylinder head will always lay on a straight line drawn between them.– Solar MikeApr 21, 2021 at 23:09
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1 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.
answered Apr 21, 2021 at 22:26
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But didn't the original Chrysler V 8 hemi heads run all 16 valves off of one camshaft ? I had a couple but never took them apart. Apr 22, 2021 at 0:47
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@blacksmith37 - Yes, but what does that have to do with the two examples provided by the OP? The Hemi has the same basic setup as the Chevrolet V8 (both are considered an Overhead Valve [OHV] configuration). The Hemi's valves are canted to allow better flow. The OP is asking about inline valves, which the Hemi does not have.– Pᴀᴜʟsᴛᴇʀ2 ♦Apr 22, 2021 at 1:20