Hello everyone. This has probably been answered a million times already but figured I would ask anyways. I have a 65 C with the O360. We found 2 cracks in the case with ECI cylinders. Since we need a new case my partner and I decided to rebuild the engine. We r buying a new case, sending out crank And rods for magnaflux. We know we can not reuse the ECI cylinders so my question is Millinum Cylinders. They state cooler temperatures and better fuel/air mixture. We just put a new RAM 520 on a C414 and RAM is using Millinum cylinders. Has anyone here put them on a O360 and if so, what is your experience with them. My co-owner is a A&P and I also work PT at a shop but not an A&P but I do have aviation maintenance in my back ground. 25 years military. We just don’t know anyone with a Mooney with the Millinum Cylinders.