From reading some other articles on it they are saying 500HP. So some Aussie journalist has probably done the sums to convert it back to metric. I think it's actualy 375KW they quoted in the original article which when multiplied by 1.34 makes 502.5HP
I think shutting down the Geelong engine plant is a great shame
That Barra 4.0 inline six still has a huge ammount of potential.
Cheers