Powertrain team’s testing shows the LS9 makes about 300 horsepower by only 3,300 rpm and a significant 320 lb.-ft. of torque at only 1,000 rpm.

The engine’s rev range is competitive with many overhead-cam engines, but we’ve also got usable torque at every notch on the tachometer.
It’s a also a compact, relatively low-mass package, which helps the ZR1 achieve a better power-to-weight ratio than the Porsche 911 GT2, the Ferrari 599 and the Lamborghini LP640.