No, I think you got it wrong. I believe you take "compression reading" for "compression ratio". We are talking about compression ratio so you have to calculate / measure the total capacity of the combustion chamber (gasket etc.. including) end calculate the compression ratio compared to the total engine displacement. This is very important and that the number we need. It should end at approx 8,5/1.
There are a lot of good readings about this on internet. Or just buy any silly tuning book. Most of these books are totally useless, copying each other but.... they all have the right calculations in it.
Okay I'll look into that then cheers
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