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2015 Corvette Z06 rated at 650 hp

The Z06's supercharged V-8 engine is the most powerful ever offered by Chevrolet

Published: June 9, 2014, 10:00 PM

2015 Chevrolet Corvette Z06

When GM revealed the 2015 Chevrolet Corvette Z06 at the North Amercan International Auto Show in Detroit in January, the company said it would produce at least 625 horsepower.

Now the official ratings have been revealed and they handily top that projection. The supercharged 6.2-litre LT4 V-8 engine is SAE-certified at 650 horsepower at 6,400 rpm and 650 lb-ft of torque at 3,600 rpm.

Those figures make the Corvette Z06 the most powerful production car ever from General Motors

There are a few supercars with labels such as Ferrari, Lamborghin, McLaren and Porsche that claim to top that power output – but nothing at anywhere close to the Z06's price point.

And unlike those ethereal exotics, the Z06's engine doesn't have to be buzzed to perform. GM says the LT4 generates 457 lb-ft of torque just off idle and 625 lb-ft by 2,800 rpm, and it maintains 90% of its peak torque (592 lb-ft) from 2,500 to 5,400 rpm.

The V-12-powered Ferrari F12 Berlinetta, by comparison, achieves its torque peak, which is about 28% lower, only at 6,000 rpm.

The Z06's engine surpasses the Porsche 911 Turbo S's peak power output by 90 horsepower and its torque peak by 134 lb-ft.

The LT4 is assembled at the new Performance Build Center at GM's Bowling Green Assembly Plant and at GM's Tonawanda engine plant in New York. It is matched with a standard seven-speed manual transmission or an all-new, paddle-shift eight-speed automatic transmission built in Toledo, Ohio.

The 2015 Corvette Z06 goes on sale in early 2015.