God only knows what you can expect but what you would like to see is anything less than 10% and I would think on a new motor with properly seated rings that you would see more like 5% leakage or less. So in other words if you put in 50 PSI you want to see something in the area of 45-50 on the leak down guage and if you put in 100 it should show 95-100. You doing this leak down yourself, have you the tools, and how much PSI are you planning on putting in there?

Mark