I was able to get new New Zealand castings from a local machine shop in MPLS, MN. The name of the shop is Cylinder Head Service.
I have had more than one person send me heads bought off ebay for port work. The Chinese heads looked like something that was forged... well in China.
I remember a thread on one of the forums. This guy received one of those bad heads. He returned it, and they sent him one of the better castings. Squeaky wheel gets the grease... I guess my point is, know who your dealing with so when you have issues, you have some recourse. Above all, ask questions! Like where was it made? What is the warranty? Does the warranty cover labor? Complete or bare casting? New casting with remanufactured hardware or all 100% new?
Todd