Sorry to hear about the engine Rosty.
I don't know what year of CAT you have but we just had a 2005 C15 break a Variable Valve Actuator housing a few months ago. It broke the head, bent a valve and a bunch of other stuff. Final bill was $13,000. Worst of it is, this VVA casting is a known weak point on some model years of Acerts (known to everyone but of us of course). Moral of the story....if you have an Acert, check the VIN to see if its' been upgraded or you may be back in there again.