It looks like the horsepower wars are far from over in the States and may see Chevrolet’s new Camaro ZL1 released with a higher power output than was originally planned. The ZL1 (pictured) won’t reach American car dealerships until early next year, but fresh reports are claiming that power output for the pony car has been bumped up to more than 570 hp (425 kW).

When the ZL1 officially debuted at the Chicago Auto Show, GM said the supercharged 6.2-litre engine would have a max power output of approximately 550 hp (410 kW). That was all good until word came out that the 2013 Ford Mustang Shelby GT500 was expected to use a supercharged 5.8-litre V8 with up to 620 hp (462 kW). With Ford now throwing down the challenge, Chevrolet was left with little choice but to upgrade its hardcore ZL1, just to stay in the fight.

We will have to wait and see how these two old enemies battle it out next year, but this new horsepower war is only just getting started.

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