Update, My son and his friend spent 8 hours so far, probably a fair amount of standing around. But they have the exhaust and intake off, today they hope to get the head off. Looking at intake valves through the ports, it is shocking how dirty they are from the EGR, but the ones on #6 look shiny and new. I think we know where the head gasket likely failed. EGR is NOT going back on. Everything went smooth, two bolts broke on the exhaust flange. Overall good progress. He has been taking notes as it comes apart, hopefully he will be able to put it back together.