With as many head choices as we have today, you need to take a hard look at these heads even if your engine guy says they are cool. I looked around some and found out the following I believe it is correct.

The Pro Top Line heads are cast in China then shipped to New Zealand for machine work. Only problem with this that I can see is the China heads (and there are several brands) don't have any "Verifiable" quality controls in the casting process. They DO NOT have a minium standered for the process itself nor for the alloy. Another words you get what you get, but you don't ever know for sure what that is. I would have no problem at all with the KIWI's doing the machine work.

There are several really good heads on the market. Granted the American heads are far from cheap, but is that actually true if you have to do the job more than once because in the process of trying to save a little money you bought a sub-standered part? Good Luck !!

RS