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.
