I have a set of Indy's CNC ported Hemi heads and had no issues with running them BUT I did find out that during an inspection of the heads and springs, I found that the spring heights were all off, the springs were not sized properly for the cam, and obvioulsy set up by someone who didn't care or know what they were doing. The springs were assembled using the same shim under every spring and installation heights were not corrected. There was about .050 varience in spring height from biggest to smallest. I bought a tool to machine the spring pocket to accept a spring cup and corrected the depth at the same time.
Oh, did I mention I bought these new and direct from Indy ... You would think they would know better...