Originally Posted by zildjian4life218
Edit: Also that crack checker says non ferrous metals so would that be cast iron heads only? no aluminum?
Non ferrous metals is anything EXCEPT cast iron/steel Examples of non ferrous metals are aluminum, brass, bronze, pewter, zinc, etc.
That said, there's no real reason a dye/penetrant-type crack detector couldn't be used on ferrous metals, although I would want to look for a system designed for use w/ferrous metal if that's what I was working with.