Mopar ( Tube Kit ) info requested !

Everyone thinking about this needs to be aware that:

• The galleries are 'step drilled' from front and back, meaning that that they reduce in size slightly, in steps, as you go further in. So the drilling will get slower and slower as you go deeper.
• Drilling cast takes patience and no heavy hand on the drill pressure, slow drill speeds (I've done OK with 400-500 RPM), and, in my limited experience, benefits from pulling back a bit frequently to allow the chips to clear or unpack.