Thanks for the kind words everyone.
Joseph... good point about the coolant flow through the heads.
A second line to the schraeder valve will help a lot. Good idea.
I could be wrong but I think you will see a nice increase on the low end when you advance it.
Chris... I am sure the hole could be left out if needed but would like to add that I was thinking about offering them with tapped holes so users could use braided hoses or a catch can setup or whatever.
You read my mind about the black powder coating. We were discussing a flat black or crinkle finish with the face recut afterwards.
We make a billet thermostat housing already but I don't know if it is what you are looking for. They are out of stock right but we will be making more in the near future.