I am finding quite a few ISX engines with blown head gaskets. I went to 4 shops in the Somerset, PA. area, all of which have had ISX engines with blown head gaskets due to sunken liners. Cummins has no repair other than a new engine, which cost $25,000 & up, plus labor to replace engine & to put your engine back together for returning for core credit. I can repair them, in your truck, for $1,200 plus travel time. It is a permanent repair that you do not have to worry about. I have successfully repaired 5 of them in the past couple of months. My repair is the same as Cat uses for C10-11-12-13, & Cummins uses for L10 & M11. They just do not have the machine tool & the shims for the ISX yet.