Thank you for the responses Scott and Kendel. I will contact Corona to see what they have available on Monday. Another mechanic friend of mine suggested Avian in Bellingham and I was able to talk to Mike in the cylinder shop. He said he was overhauling 5 cylinders this next week and three were still available (as of noon today). With my high time engine (2000 hrs since overhaul) I was wondering if it might be prudent to keep a spare for the next 'event'. I think you answered that question.