I don’t believe 440 Source has offered the Stealth heads CNC ported in quite some time.

Not that you couldn’t buy the heads and have a porting service do them up.

I had a customer looking at buying some Stealths and called about them the other day.
He was told they didn’t expect to have any for quite a while.

I think many heads(and a lot of other things as well) are going to be bought based on availability.