The Callaway "Sledgehammer", a heavily modified 1988 Corvette C4, became the fastest ... Top speed: 205 mph. C7 ZR1 (2019-2023): Chevrolet’s most extreme production Corvette at the time ...

According to the dyno (right), Callaway's Corvette reaches its peak 627 hp at 6,400 rpm, an additional 167 hp over the standard car and 23 hp less than the upcoming Z06.The Callaway's max 610 lb ...