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DOHC allows for an engine to spin faster to make HP, while reducing displacement VS a comparable output OHV engine. The result is better startup emissions, no doubt aided by the modern incorporation of individual cam phasing.
This is also the big reason why there's been no N/A replacement for the LS7, yet.
People often forget how much regulations play a role in forcing engineering design one way or the other. So consider that before claiming "this" is better than "that". For example - a major reason the LT4 was designed the way it was...with a smaller supercharger and low intake plenum cover...was so the Z06's hood could be low enough to pass EU pedestrian standards!!!
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"Keep the faith." - Fbodfather
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