Someone might be able to give you that measurement, but it might vary slightly depending on what piston you are using. Might also vary depending on whether you comparing OEM or newly manufactured liners and the height of muffs also vary slightly. Compression plates need to be factored in as well. Best to measure the distance of the ring land from the crown of the piston. Then you measure the distance between the top of the liner and the piston crown at BDC and add the two measurements. Make sure when you dry assemble the cylinder and piston (easier to do without rings installed) you install the compression plate if you intend to use one or add the compression plate/gasket thickness to your total. Personally I would be more worried about the oil hole feeding oil above the oil ring into the second ring as that’s what I have found on more than one occasion. Then as mentioned, there is making sure the hole (or a little trench leading to the hole) lines up with the feed hole on the case, but I will add to that.... the entire thing may be pretty much redundant if there is much in the way of clearance between the liner and the case. That number seems to be all over the map as well. I put the oil holes in, but not sure I will bother assuming there is a next time.
Hope this all make sense... breaking my rule of not posting before finishing my first cup of coffee.
