This thread is fascinating to me. In my opinion the "Holy Grail" of Flathead performance is to get the edge of the cyl as close to the edge of the intake port. Then using a pop- up piston to give the air charge a large chamber to flow into. So far that's my theory but I plan to put it in motion very soon. I would like to get the largest practical cyl bore dia with the largest intake valve I can get in there, and I'm gonna use pop-ups on the street in my coupe. Don't see why not.
Would love to know how you fellas are getting such large cubes. What bore and cyl wall thickness are you ending up with?
I want to emulate this situation in a Ford Flathead....
