Hennessey Cranks GT350 To 575 Horsepower Sans Supercharger

hennessey-shelby-2

Ford announced with great pride last year that its 5.2 liter “Voodoo” engine, at 524 horsepower, was the most-powerful naturally-aspirated road-going engine the brand had ever built. At just over 100 horsepower per liter without any sort of forced induction trickery, Ford had really outdone itself…and as usual, John Hennessey is waiting in the wings, eager to prove that despite what the Blue Oval says that there’s little left on the table, there actually is more power to be found in the right hands.

hennessey-shelby-3Enter the Hennessey Performance HPE575 package for the Shelby GT350, which forgoes all forms of forced induction and yet still manages to squeeze almost 50 more horsepower from the Voodoo V8 than Ford’s best presumably could.

Nominally rated at 575 horsepower and 511 lb-ft of torque, Hennessey is promising to add 49 horsepower and 89 lb-ft of torque to an already-menacing machine. While Hennessey normally resorts to superchargers or turbochargers, this time around he kept the modifications simple. Stainless steel long tube headers with 1.75-inch primaries and a stainless steel mid-pipe team up with high-flat catalytic converts to help the Voodoo engine breath easier. A new Hennessey engine management system, dyno tune, and 100-mile road test brings everything together into a nice, neat, powerful package.

Mind you, this is flywheel-rated horsepower, though with this package a HPE575 Shelby should still squeak over the 500 wheel-horsepower mark, or right at it. Hennessey also adds a serial-numbered plaque in the engine bay and cabin, Certificate of Authenticity, and Hennessy floor mats in the package, which costs $6,950 including installation and a 3-year/36,000 mile warranty. If you want to do installation yourself, the HPE575 package costs just $4,995, but doesn’t include the warranty.

It might be worth it to get the warranty and leave this install to the professionals.

About the author

Chris Demorro

Christopher DeMorro is a freelance writer and journalist from Connecticut with two passions in life; writing and anything with an engine.
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