Thanks for that bit of information. I've always heard that a larger bore unshrouded the valve and allowed the head to flow more. That's why I asked the original question.
Better don't always mean a lot better and or worth while, I remember a test where they compared Chevy heads on a 4 vs 3.75 bore and there wasn't a huge difference, like 5 cfm.
I'm sure idea those bore sizes are for valves a lot larger than 2.08"
