The Z06 uses the LS7 a 7.0 (427) Gen IV n/a engine that makes 505hp
the ZR1 uses the LS9 a 6.2 Gen IV with a brand new Eaton 4 rotor supercharger with intergral intercooler(thats what you see in the window)
427 was fine, but with its high compression ratio, its not exactly supercharger friendly. The LS9 got a lot of the LS7's pricey parts like titanium rods and valves, etc, and can safely make over 620hp with a warranty.
Corvette might take on a Porsche 911 type system where they have different levels of performance. Think GT2/GT3 vs Z06/ZR1 type stuff.
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2/20/2013: They Day the ****s Stopped
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