Bernhard, sre you 6doubleduece on DTR? Your probably right about the the head gasket and timing. I lost mine at 40psi. with water meth. My timing is 1/8" and is fine for daily driven work truck. I am proably gonna move it all the way until it stops. Me and a few other diesels are going to the track on January 1st. Hopefully you can make it. Where are you going to dyno your truck at?