When you rebuilt your motor how did you clean this passage out? I already had my block clean professionally which was a nice job, however after reading some articles they mention rear cylinders run hotter? They say it's due to this specific water passage getting partially clogged. I looked with a flashlight and looks crappy in there :)
Follow Ups
Cleaning water passage behind water pump - Coldfusown13:52:44 01/30/12