I've heard it said (and it makes sense) that the only source for 390 cores is a crashed late model SR-20. So yeah probably rare as hell.Aerosport gave me a flat “nope” when I tried to get a quote for a 390. Lycon seemed positive initially, but are not answering emails now. Barrett have been the best so far, answering emails until a few weeks ago, but told me there was *one* engine core which they *maybe* able to get. Not looking positive for a build from anyone other than lycoming tbh. If I don’t get a commitment from Rhonda by the start of the new year I’ll sadly have to send my money to “big engines” and wait a couple of years, then end up with a stock engine I have to modify myself (EFII).