Looking for X Head Picture

PRH said

Is the Hughes valve a true nail head or a semi tulip?

My experience is that the semi tulip valves(like an SI SEV-2811SG)aren’t much better flowing than the OE valves.

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It is a nail head. I made a tulip intake valve once with epoxy and turned it down. Thought at least somewhere in the flow curve there would be some benefit. None. Exhaust is a different story.