Under high boost, I am pushing coolant out the overflow. I am pretty sure that the head is flexing slightly, causing the headgaskets to unseal. Under low boost and daily driving, everything is fine, no coolant push issues.
My machinist and I have been discussing O-rings and other options. I am not exactly sure what my plan of attack is at the moment, but I will let you know when I get there. I have the utmost faith in my machine shop, as they do all the AMS GTR engines, including their 2000whp shop car engine .