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A zero lash cam would have to much duration for best results.

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Not true. All cam specs are based on the actual lobe, not the "after lash" measurement. Subsequently a .600" lift cam with .020" lash will only yeild .580" lift.

And more to your point, if lash is .020 then whatever the .050 duration spec is remains unchanged at the valve since the lash is already taken up before the .050 point. Only the "advertised" duration would be less at the valve after the lash adjustment.

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The best scenario would be instant open/instant close on the valves, but that isn't possible. Yet.

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Actually it is "possible". A buddy of mine in the R+D biz says Honda has an engine with no cam that uses an ECM and solenoids or stepper motors to open/close the valves. Think of the possibilities, infinite cam timing changes on the fly so it can idle like a stocker and pull like a prostocker on the topside and everything in between. The wonders of modern technology .

I can't even imagine the $$$$.

Kevin

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Just guessing here, since I don't work for a valvetrain manufacturer, but allowing for the valve to fully seat on the head and cool is part of it, along with allowing oil into each point of contact bewteen parts.

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this is what I've always been told. Some cam profiles need more lash to get proper lube/cooling time.

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If you understand this so well, what is the point of your post?

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