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"
That said, those 5 cfm could be 10-15 horsepower. Some guys would kill for that kind of gain.
I know Pro stock stuff is huge bore. Give me a bigger bore any day of the week
