I've had my SHO for 9 years.....garage kept. I leave the motor down and hopefully drain completely. Just out of curiosity I broke open the flush port and watched it drain. Close to a 1/4 cup of water or more came out of the port....kinda shocked me since the engine had been left down overnight. Could this be part of the problem with heads cracking in colder/freezing weather. I do not know the answer, but just an observation on my part. Lots of entrained water came out of that flush port. Any thoughts are welcome.