It’s official, after months of speculation and rumors, final testing has indicated that the most powerful factory-built Ford Mustang ever just got even more potent. Final certification testing of the Shelby GT500′s 5.4-liter supercharged V-8 shows it will produce 500 horsepower and 480 lb.-ft. of torque – 25 more horsepower than preliminary estimates.
Initially the Shelby GT500, soon to be available in coupe and convertible form, was slated to make 475 horsepower, but an increase of 25 hp makes all the psychological difference – it’s now in Viper territory. Torque will be just shy of the Viper at 480 lb-ft, but ample nevertheless.
The engine is force-fed air via a “Roots-type” supercharger providing 9 pounds per square inch of boost. Components, such as its four-valve cylinder heads, plus piston rings and bearings from the Ford’s supercar, the mid engine GT40, will be included for the Cobra.
The 500 hp rating was obtained using the Society of Automotive Engineer’s (SAE) latest standard and was witnessed by an objective third party. The Shelby GT500′s 5.4-liter supercharged V-8 will be built at Ford’s Romeo Engine Plant in Romeo, Mich.
The auto industry’s best performance car value? Maybe, and there’s no doubt Ford dealers will be hanging that moniker around its new GT500′s rearview mirror when pricing is finally announced, which is expected to be around $50k when the car goes on sale this summer.