should be machined down .010 more then the center where the disc runs...This procedure adds more clamping force, putting more holding pressure on the disc. They came stock with a .008 step and I like to put a .010 step in them. The RPS sport pressure plates has 200 lbs more clamping force then stock so you will be alright, But the 200 lbs extra clamping force rating is with a .008 step in the flywheel.