CAT C15 blown headgasket on fresh inframe.

[smorgan87]

So as the subject says i recently had a c15 acert inframed by a friend of a friend (yeah yeah, i know) hes got 20 years of exp building big diesels of all sorts. New {AFTERMARKET} Head, complete {AFTERMARKET} 16:1 kit, ivas removed, new spacer plate, block cut, the whole 9 yards. Bobtail back home 500ish miles, cpl days later go grab a loaded wagon and 2 miles later BOOM. Coolant reservoir explodes from what we determined to be more combustion gas than what we were getting prior to inframe. So we finally got it back down to the shop and get the head off. EVERY SINGLE CYLINDER was blown out on the head gasket and the areas of the gasket around each cylinder were eat up. Any ideas what would cause such a thing? Our only working theory is horribly stretched head bolts that allowed the head to dance. We have since replaced the head gasket with a cat oe as well as new OE head bolts. Just an idea of how little the engine was ran before it blew the gasket. The sacrificial orings on the injector tips were still whole and intact. UNILEVERS custom tune so im not thinking a tune problem.