Hey there, 04 6.0l egr cooler oil cooler and head gaskets done 19000km ago came in now for excessive purging out degas bottle, egr cooler badly failed , replaced egr cooler and oil cooler retest just started to build 20 psi mgp and coolant pressure was already at 17 psi, removed cylinder heads, gaskets looked not bad, sent out heads were cracked in usual places , but advised to replace any way, so has 2 new cylinder heads new egr cooler and oil cooler , test drove today still building excessive coolant pressure, used combustion tester chemical, came out positive for combustion in coolant, any one else had problems with a block? or what else could cause this?boss wants to order a short block .help me thanks