There's no doubt the 2014 Chevrolet Camaro Z/28 is great track machine, but it seems some enthusiasts aren't quite happy with the 505 horsepower and 481 pound-feet of torque delivered by the naturally aspirated, 7.0-liter V-8 engine. Fortunately, those in need of more power with a Z/28 badge can take it to the handful of tuning shops that offer various upgrades for the muscle car. One of them is Hennessey Performance,->ke1863 who has no less than five packages in store for the Z/28.

The range begins with the HPE600, an upgrade that increases the engine's output without meddling with its all-motor nature. Using ported cylinder heads, revised valvetrain parts, a new camshaft and Hennessey's trademark engine management calibration, the HPE600 update takes the Z/28 stock output to a whopping 636 horsepower. That's 131 ponies over the standard vehicle and a whole lot of power for a mill devoid of forced induction.

As is the case with most of its creations, Hennessey dropped the Z/28 HPE600 on the dyno for proper testing and tuning. The run revealed the muscle car->ke507 gets 552 ponies and 474 pound-feet of torque to the rear wheels. Is that enough for you? Hit play to hear that beefed-up 7.0-liter LS7 engine roar!

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