Hey Mixx,
Unfortunately for me, I bought a yfz engine with a blown crank and supposedly a good head. Turns out the head is unusable, as it has a minor chip where the valve goes through the head, on the bottom side. If you'd like to use it for flow testing or anything, let me know and you can have it for whatever shipping costs. Perhaps you can get some use out of it instead of me just junking it.
Pat