They do flow a lot better than the stock cast iron head, so don't get me wrong.
But comparing it to Mike Kirbys cylinder head, it does not flow well.
I think another reason they cannot flow well on there smaller Ford six cylinders is because there bore is smaller than the Chevy's? So it forces you to use smaller valves.
But yes, it seems people are interested in that cylinder head. Look @ the smaller 6 cyl. Ford stock cast iron integral intake,, pathetic. So anything should be better that the original design. I forgot how much is the guy asking for their 6 cyl aluminum head?
