I have know idea why i didn't get a notification that some one had posted up on my thread.
Not Ignoring you all. just stumble on it. and i'm glad.
Ok first Yes this is a test head.
PRH i will dig up my notebook and see if i can match a pic to my notes so i can answer you questions.
But to start with.
Here is the history of this particular head and how it got to this state.
Started out on my first 340. 360 head 974 w/188. Dropped a intake valve and destroyed my cyl block.
New motor, same head with one hardened intake seat and 8 exh hardened seats. bowl blend to hardened seat on one intake and exh. made plastic templates so i could make all the rest of the bowls the same. This was the first time with a die grinder and a cyl head.
Head before would rev 6000 rpm after porting would rev to 7200 RPM same compression same cam same everything. head was the only thing different. Was a dog at the track and ran a full sec SLOWER! Acted like a 2 stroke and had no power until 4000 rpm and then just took off. And it wouldn't pass emission either.
Pulled them and put a stock set of X head on it and was happy. had bottom end shift a 5800 rpm.
So after i builts my first real(????) porting bench. i when a searching for these head.
When i first get these number for you. you have to understand, that this bench was to small and after 300 lift i had to drop from 28" down to 10 and do the math from there to represent 28"
I was vary good at making turbulence in these ports and at 10" it was hiding a lot of it.