Ok, I am used to seeing exhaust leaks giving a brown or yellow dusting, but I have been working on 2 different aircraft and both have had cylinders where the paint is turning pink. Once has a full engine monitor and CHT's are reported as normal, the other has no monitoring and most of the head is turning pink on the upper surface away from any exhaust or intakes ports. So I have only ever seen this on these 2 airplanes, one is a 360 Lycoming the other is a 65 Continental. I almost feel that it is an indication of overheating and when I pulled the exhaust on the lycoming, the gasket was showing a good seal...so I am not sure how to proceed. Tim