Blown head gasket. I went 11.56 on 20 pounds of boost with a popped gasket. I was happy with it being 88 dgrees and 100% humid. Have you checked your oil though. If yuo have run it that long and the oild is contaminated, I hate to say it but you will probably have to pull the engine. You will have to look at all hte bearings and all bearing surfaces. I use the cometics myself but am trying a different approach. If it works I will let you know. The steel shims are good to.