Thanks Tod, hardtimes & others on the site have been very helpful with the performance information. I was just trying to figure out the performance difference between your Winfield crow's foot & the new Thomas iron head you are building?
You have a fair question

! Your question is similar to one comment ask here recently, i.e.- would like to see comparison tests with ALL of the new heads and see performance results (essence of Q)
IMO/answer to both questions is with a question...are YOU aware that there is a LOT of money involved to make such testing happen. Think about the amount of time/money/effort/cost of collecting ALL such heads in one place with a dyno machine and competent owner/operator

!!
Each/every head would have to have exact same same equipment to test each head , with same attention to detail/conditions...good luck setting that deep pocket situation up.
So, is there an alternative...yeah, seat of the pants testing by serious minded members here, who would like same answers as YOU

. Ok, so it still wouldn't be sooo easy and/or technical. Would/could YOU trust it then..ha !!
As you see an answer to this type inquiry is complicated, to say the least.
Like er, ahh, um..model As, we all have opinions and most times most opinions are different.
My opinion has pretty much been established, in writing, regarding Tod's making NEW stuff (heads) for us, especially in NEW cast iron. WHO else,eh
I tested and am still using his first cast iron example Winfield head. I am really happy with what I working with in this head. As said , it is working hard with no problems and I do not expect any. But, WILL report if any such problems occur. However, do YOU believe what I've said/done/written ? Maybe not. I've had one Fordbarner ride with me right after the head install and tune. I think that he has expressed his opinion here also. In life I know that there is good reason to be skeptical of everything !! Every Fordbarn member/friend , come look and even test drive for yourself, while it is still on this B
