Here's another piece of advice, Mark: if it was tight after initial assembly, and didn't free up completely immediately after a very short no-load run, it is likely to need prolonged and careful running-in, or it may seize partly or completely. That ruins engines, so I suggest you avoid it. Did you check the ring gaps? If it is just the honing marks in the bore making it tight, a gentle run-in will save it, but if the ring gaps are too small, it's going to seize, the only question is when.
