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This summer the most powerful Mustang ever will go on sale, and Ford announced today that it would have 25 more horsepower than originally estimated. The Shelby GT500 was just ran through the Society of Automotive Engineer’s ringer of tests and came out the other end with an official rating of 500 hp and 480 ft-lbs. of torque. The supercharged 5.4L V8 uses a roots-type supercharger providing a not insignificant (for OEM) 9 lbs./square inch of boost. Many of the engines components were also borrowed from Ford’s supercar, the GT.

This news certainly makes the battle for domestic dominance interesting, with the Dodge Viper rated at 500 hp and 525 ft-lbs. of torque and the Corvette Z06 coming at a perhaps conservative 505 hp and 470 ft-lbs. of torque.

Follow the jump for Ford’s full press release.

[Source: Ford]


-Ford Shelby GT500 officially rated at 500 horsepower, 25 horsepower higher than preliminary estimates
-The Shelby GT500 will go on sale this summer with more horsepower than any previous factory-built Mustang

DEARBORN, Mich., May 2 - The most powerful factory-built 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.

“With 500 hp and the Shelby name, this car is an instant legend," said Hau Thai-Tang, director, Advanced Product Creation & SVT programs. "This is the most powerful, most capable Mustang ever."
The Ford Shelby GT500's supercharged 5.4-liter, 32-valve V-8 is a result of Ford's experience in developing the modular V-8 and V-10 engine series. The engine is force-fed air via a "Roots-type" supercharger providing 9 pounds per square inch of boost. It borrows the four-valve cylinder heads, piston rings and bearings, from the Ford GT engine.

The 500 hp rating was obtained using the Society of Automotive Engineer's 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. Pricing will be announced closer to launch.

The right to purchase the first 2007 Ford Shelby GT500 was auctioned for $600,000, with the proceeds benefiting the Carroll Shelby Children's Foundation. The 2007 Ford Shelby GT500 goes on sale this summer.

Technical Specifications
Type V-8
Manufacturing location Romeo, Michigan
Configuration Iron Block and Aluminum Heads
Intake manifold Cast-aluminum with Roots-type supercharger and air-to-water intercooler
Exhaust manifold Cast iron
Crankshaft Forged steel
Throttle Body Dual 60 mm, electronic
Valvetrain DOHC, 4 valves per cylinder
Valve diameter Intake: 37.0 mm; Exhaust: 32.0 mm
Pistons Forged aluminum
Connecting Rods Cracked forged steel I-beams
Ignition Coil-on-plug
Bore x stroke 3.552 x 4.165 in. / 90.2 x 105.8 mm
Displacement 330 cu. in. / 5,409 cc
Horsepower 500 hp @ 6,000 rpm (SAE Certified)
Torque 480 lb.-ft. @ 4,500 rpm (SAE Certified)
Compression ratio 8.4:1
Redline 6,250 rpm
Idle Speed in Neutral 750 rpm
Engine control system Spanish Oak PCM
Required fuel Premium
Fuel Injection Electronic returnless sequential
Oil capacity / type 6.5 quarts / Motorcraft 5W-50 Full Synthetic Motor Oil
Coolant capacity 21 quarts
Peak Boost 9 psi

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