Dave (K&G) is a very nice guy. He has my engine right now.

If it helps at all, I have a pair of his cnc ported 906 heads. Have run them for years without issue.

He advertises that his cnc'd 906 heads flow 290 on the intake. Another well-known porter on this site told me that he flowed a K&G cnc'd 906 on his bench and confirmed that they flow as advertised.