12 valve seat pressure

What is a good closed pressure to shoot for? I am in the process of redoing my head, currently have a manely dual valve spring that was used in the old head. They had shims under the springs and I want to avoid that if possible. I have a haisely style keeper and a manely keeper, they are .050" height difference.



This engine turns 4200 rpm max with 55-60 pounds of boost. Street driven, stock cam



Please don't bust my balls too hard, I did search.

Thanks for your time.