Additionally, along with the release of the video showing GM also announced the official dyno numbers: the ZR1’s supercharged 6.2-liter V8 is rated at 638 Hp which is 18 Hp more than GM estimated when they first unveiled the supercar at the Detroit Show in January. As for grunt, GM said that the ZR1’s V8 delivers 604 lb.-ft. or 819 Nm of torque available at 3,400 rpm. –Video after the jump
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