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they could have accomplished the same performance by just modding the existing 427.
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It wouldn't have been possible given the cylinder wall thickness and spacing as Tony Skarbic alluded to. In addition, emission and durability standards would also be impacted.
Ask Katech, the people who build the C6R engines, what more GM could have done to the LS7, but still kept it 50 state legal.
GM didn't leave much on the table with the LS7. Although a tune can unlock some more power, it's at the risk of increased cylinder head temps (due to leaning the AFR), among other things.
As I've said before, fewer cubic inches and forced induction is the wave of the future. The LS9 is just the start. We already know most of the future LSx engines outlined thus far are slated for supercharging. It's the only way to get the horsepower and still meet future C.A.F.E. and emissions standards.
