ZR1 is powered by a 6.2 Liter LS9 aluminum block V8 equipped with a four-lobe Eaton® Twin Vortices Series™ supercharger with intercooler. It delivers an SAE-certified 638 hp at 6500 rpm and 604 lb.- ft. of torque at 3800 rpm. The engine employs lightweight titanium intake valves and connecting rods and contains a high-performance dry-sump oil system, which distributes pressurized oil from an external reservoir to protect vital components under high-g driving conditions. via http://www.chevrolet.co