From what I have seen the short side radius is almost non existent. This is what makes the air stand up and flow
all around the valves.
I'm more concerned with turbo engines were tumble or swirl do not mean anything and I agree the less timing the better, also a reason to use a turbo, sometime every internal combustion engine will run a turbo.
What does the above 4 valve flow with both valves open when flowing? 2 x 175 = 350 cfm or less?
I believe a small block chevy is at 400 cfm now.
