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the Z06 will produce a rip-snortin’ 650 horsepower and 650 lb-ft of torque, yielding an output-to-weight ratio very close to that of the ZR1, which pumped out 638 horses and 604 lb-ft. So you don’t have to do the math, that’s 5.42 lb/hp for the 2015 Z06 versus 5.26 for the ZR1, and 5.42 lb/lb-ft of torque for the new Z06 coupe versus 5.55 lb/lb-ft for the ZR1.
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Heavier weight seems to be the new reality along with the stat p2w. On paper, the 15 Z06 is very close to the old ZR1.
Now that the Z06 has automatic, convertible, etc. the original track oriented model is gone. What roll is there for a C7 ZR1 other than more power? Not that, that is a bad thing.
http://blog.caranddriver.com/heavy-hitter-2015-chevrolet-corvette-z06-curb-weight-leaked/