Thanks for the info. I will take a look at that o-ring tonight if possible. That's a great idea about the rubber gloves over the lifters. They are a buger when removing the rockers. As I had to do several times. I also found out about the touch of sealant on the rear cam bearing, after I couldn't figure out where all the stinking oil was coming from on the rear of the engine, and thought I had a leaky rear main and was all ready to pull the trans to replace it. I am glad I read into some of these forums and went back and looked at the manual again. I really do hope it is the o-ring. Can you put the illuminator kit on w/o removing the head.