Not sure what valve lash is...? Do you mean valve lap or overlap, i.e. advance or retard on either cam? If so, it will depend upon the type of cams, profile, timing, etc.
The problem is no matter how much I learn, I can't remember it due to being electrocuted (brain damage) It might sound funny but trust me it's not.
It' very frustrating to have a high I.Q. and no memory. Sometimes I wish I was stupid so I would'nt know any better.
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