Originally Posted by Dan Root
If you're serious about slotting them? Yes you must do before testing otherwise metal will temper with heat and be impossible to slot or XDrill! This info was given to me by the Brakeworld guys that Xdrill brembo blanks for nascar!
Dan, you must have misunderstood my other post... Yes, I am aware that any cross drilling or slotting needs to be done on a pristine rotor... And by the way, I've been doing this stuff for over 25 years now... Thank you for your concern incase I overlooked something...