If you have a dial bore gauge, set the gauge to zero when it's down into the cylinder 3-4 inches, near the bottom of the ring travel. Then bring it to the top, rocking it back and forth a little to find the maximum diameter. It the top and bottom readings are much over .005" different, you're approaching the point where a re-ring job probably will be a short term fix. I'm not a fan of reassembling an engine with used rings. If you plan on re-using the bearings, a sharpie is the best approach.

I mark the sides of the rods and caps together, both on the camshaft side of the engine. A simple 1-2-3-4 mark on the main caps and the adjacent block area will be sure to keep those parts in the proper orientation on reassembly.
Jerry

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