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There are such things as "tight lash" camshafts...
However, on the general, you NEED that much lash. The lobes are designed for it as it makes a nice gentle (if you can call any of this gentle, but it's a relative term) take-off and let-down of the valve. Otherwise it would be a very violent collision. Again, it all depends on the lobe design....some of the Comp street roller cams like around .016". Some of the other lobes like .020-.022". It just depends. It is necessary though to keep from being hard on, and breaking parts.
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