The 2013 Shelby GT500’s 5.8-liter V-8 aluminum-block engine produced 662 horsepower and 631 lbs.-ft. of torque, making it the highest-horsepower engine ever produced in North America to date. Nearly every part of the powertrain was optimized for producing the additional horsepower, including a new supercharger, new cross-drilled blocks and heads, an all-forced engine rotating assembly, updated camshaft profiles, upgraded head gaskets, a new carbon fiber driveshaft and upgraded clutch, transmission and axles.
Engine
Type: 90-degree, DOHC 32-Valve supercharged aluminum V-8
Displacement: 5.8L / 351 CID
Horsepower: 662 hp @ 6500 rpm
Torque: 631 lbs.-ft. @ 4000 rpm
Bore x Stroke: 3.68 in. x 4.17 in.
Compression: 9.0:1
Source: ebay