I got a set of millennium heads like that once from modern that I sent back. They may be fine, or they may leak after running a while who knows. I do know this, I had a set of predator heads from before indy selling them that had that same amount of porosity. We ported them a fair amount. They sprang leaks in the intake 3 different times. Chasing them with the tig torch was aggravating, and I finally just ran stop leak. They're still being used by a buddy, so not really a problem. He runs stop leak and they're not leaking, but unless I was offered a discount for them being that way, I'd opt out. Different if it was a 1 off, be glad you have them type deal.


As far as the china wall gap, as long as ports and bolt holes line up I wouldn't care about that at all. Cut a strip of aluminum to fill it, or fill it with ultra grey.