Adjusting Hydraulic Valves?

I'm replacing the rockers and pushrods on my BBC. How do I know much clearence I should leave?

thanks!

go to your local hot rod store and get a book on your motor and it will give you all the info that you need, that way you can't make a mistake doing the job

Hydraulic valves get zero lash. That you asked the question is cause for concern. I'd suggest not doing it yourself...