OnStar Calls John Hennessey While He's Testing 650+ HP Camaro Z/28. Pulling Too Many Gs?

In fact, John Hennessey, the founder of the Texan tuner, may have exaggerated a bit. That’s the only conclusion you can draw when OnStar calls the man while he’s out driving the machine on the track, believing John was in an emergency situation.

While John’s “I think I was pulling too many Gs in this bad boy” line is funny, the whole episode might be staged. Let’s be clear, we’re not encouraging fake OnStar calls by any means, but we still find this piece amusing.

Under the massive hood of the Z/28, Chevy has placed the 7-liter LS7 V8, which delivers 505 ponies in factory stock form. Contrary to what you might have believed judging by the “650” in the tuning package’s designation, the actual output offered by Hennessey is even greater.

As John explains after chatting with the amused OnStar operator, the massaged muscle car delivers 570 hp at the rear wheels, which means its crank output sits somewhere around 670 hp.

And for those of you who want to know what the upgrade includes, here’s the full list of goodies:

• Ported Cylinder Heads
• Upgraded Valvetrain Parts
• HPE650 Camshaft
• Stainless Steel Longtube Headers
• Professional Installation
• HPE Engine Management Calibration
• Dyno Tuning & Road Testing
• Hennessey Premium Floormats
• Serial-Numbered Dash & Engine Plaques
• Hennessey Exterior Badging

We're curious about the fate of the Z/28 now that the sixth-generation Camaro has landed. That's because, despite the badassery injected into the current fifth-gen model, sales of the limited-edition model haven't exactly raised up to the expectations.