I've been looking for the cylinder head data base for months.  I believe it was started by Chevy High Performance but I can't fine it.  Do any of you know were the link is?  

As I'm sure you know the new website format for CHP is horrendous. My bookmark for the Cylinder head database does not work and the links to it in CHP's site also are not working. The same article was put on Car Craft's website, but that is also not working. I would check out Stan Weiss's flowbench database, I believe he used some of CHP's numbers and he has many more cylinder heads listed, although with undocumented sources. But I'm sure you know of the inaccuracies/inconsistencies of flowbench testing.