C5R 427 no doubt! That would be an extremely expensive motor, but it would be killer. I never got to ride in an 02 ZL1 with the Stage III motor, but I heard one with exhaust cutouts. It sounded SO bad ass. I got to drive the HRSS454 which has a 454 CID C5R, it was exceptionally smooth. I was extremely surprised by the low end throttle response.
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