We never did a rw dyno on the car. The motor was rated close to 600 h/p at the flywheel on a bench dyno. The motor build, for the race program who is usually a pessimist when it comes to h/p quoted mid 500's. It did spike 600 in the power curve test on the bench. Remember this is with custom made cams and chips programmed beyond those from JWT, race fuel etc etc.