I have been on the mad hunt for 6090D 352 hipo heads. No luck unless I want to spend 2k or better. I came by a set of 6090C closed chamber heads today. 850 for the set and they have been upgraded to 2.090 and 1.650 valves and have hardened seats in them.
All i know about these heads is that they are off of a 406 tri power. Can any FE master tell me more about these heads? Any issues on a 352? I didn't know there were more closed chamber heads besides the 352hipo heads or some of the more rare cobra jets later on in life.
also when I say closed chamber I mean the smaller combustion chamber. I am stuck in my Cleveland days.