I put my T206H (TIO540-AJ1A) in for annual in Oct. During that time we found that SB593A applied to my intake valves. I started a thread about that (got derailed by know it alls) where the advice was to have the exhaust valves checked while the cylinders were out. So I followed that advise, the result of which is that the cylinder shop is saying that ALL the exhaust valves are out of spec. I find that hard to believe on a 600+ hour engine, but that's what I'm being told. No biggie, I think, just get new exhaust valves and pay to redo the guides, etc. Well EACH exhaust valve is $1800 (no typo). So the parts and labor JUST to redo the exhaust valves is $15K. This is not R&Ring the cylinders, this is also not the intake valves, piston rings, etc. That is all being paid for by Lycoming. First thought it I am going to go measure those valve stems myself, bring my own mike, gauge block, etc. and make sure the measurements are accurate. Second and most hopeful thought is that we are trying to get Lycoming to help us out because this is really an unfortunate situation. They have suggested that we might be able to get a really special deal on brand new cylinders complete from the factory. I expect they will be in the $2K range, I hope, they list for over $3K. Still that is $12K, best case to top a 600+ hour engine. There are no PMA parts. I would never not fix it right or put a dangerous plane in the air, but after this my first thought is to bite the bullet, fix it, then sell, and take a break from flying. I've had old planes and new ones and they all seem to give you a little swat to the wallet when you least expect it. Anyway, here are the measurements from the cylinder shop. Any advice or recommendations at this point?