1988 Callaway Sledgehammer Corvette This Sledgehammer reached 254.76 mph at the Transportation Research Center (TRC) in Ohio and became the world’s fastest street-legal car for some time. It was built up by Reeves Callaway in Connecticut as an example of what was possible with the new ZR1 and and turbocharging its LT5 engine. The result was a 898 bhp coupe that still retained luxuries such as air conditioning and a radio. Callaway achieved this power by using a NASCAR-spec block … Continue reading 1988 Callaway Sledgehammer Corvette