Chevy valves-J heads rocker geometry tricks

Do you think the valve knows what head it's in? Or cares? Out of curiousity... You do know Magnums and Edelbrocks and aftermarket Magnum based heads all use 11/32 valves... right? Think there's a reason for that? The tulip mopar type valve helps when the bowl and port aren't that good. They help air turn when the port doesnt. But a thinner stem is less "in the way", less friction in the guide, and lighter... and the nailhead valve will flow more when the port can be shaped properly.