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. Thanks in advance.

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