Do I need a lost motion assembly?

I have a Honda civic 96. With a d16z6 block and had a y8 head before but have a z6 head thats gonna be going in. And I bought one with no LMA. (Lost motion assembly) so was kinda skeptical. Didn't really know if I really need it. Do I? What does it do with it? Can I ride with no LMA?
What will it stop if I don't have one.

As you should know, Automotive Engineers DON"T add things to engines that are NOT needed. The exception would be counter rotating shafts. That is done to smooth it out, which is not needed… Just desired. They have upgraded versions. But here is the reason for them…http://www.superhonda.com/forum/f146/lost-motion-assemblies-explained-224573/

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