How much decking is to much?

Assuming your talking about a factory family motor (LA small block so to speak), my opinion is if you want to deck it square (flat), great. IF you decking it for compression, my question is why? Pistons will get ya where you want to be for compression. And compression is not the tale-all of the story of performance, flow is....

• to answer the question, I don't know how much you can take off the block and be safe. Each block would be different. (if I understand the question).