318 power!
That's quite remarkable. Is the Ferrea 3/8 or 11/32?
I'm sure they do a ford valve that's 1.78
We are required to run Stock stem size.
The Ferrea valves were the best on the
flow bench even stock by quite a bit = as we tested everything
we could find (But they are not cheap).
When we are done with then they resemble a nail head
basically as Flat as my X Wife.
Remember, we are stock lift limited and port CC limited and it irrelevant if they
flow backward over 400 on 318s and 470 on 340s.
A tulip valve might be better at 600/700+. I do not know because
I do not live in that neighborhood!