944S2 968 Valve Spring Seat Pressure? Shims?

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Hello,

I am relatively new here and I need help please. I have been slowly restoring an S2 and I am in the process of rebuilding the head. The valve guides are in great shape and are well within spec. However, I can only locate limited information on what the OEM valve spring seat pressures are suppose to be. The FSM does not address this. I am not an expert on Valve train rebuilding and I do understand how critical this part is and I want to get it right. I need a baseline of what the springs pressures are suppose to be so I can test the ones I have and then shim accordingly. The head will remain stock other than being decked.

Also if someone has a written procedure for the S2 or 968 valve train rebuild that I could reference other then the FSM that would be very helpful.

Thanks in advance.
Page H. in Bend Oregon