The TCM relearn process is brutal. Did it once the first time I loaded the 310 tune and installed the TCM. Haven't done it since after loading tunes. It feels like I'm beating the crap out the truck and around here there really aren't any safe/good places to complete the procedure, aside from paying $55 to go to a test and tune and do it at the track. But to do something like that you would basically waist half of you day just because you changed/reloaded tunes. It just seems like a hassel, but hey, I guess that's the price you gotta pay for making this much power!
What ever happened to Spartan releasing there NZL, (near zero learning, if I remember correctly), tunes?
Sorry, back on topic. The one and only time my trucked puked it was after I was already at operating temp and had been cruising down the freeway for about 20 minutes. I was making big boost, 57 psi worth, and let off the throttle very suddenly as soon as I realized boost was that high. The truck then began to puke for the rest of my trip, which was only about 15 minutes, but I did have another grade to climb to get home. After parking the truck over night it never puked again, but I never beat on it until I did new HG/studs.
I was not monitoring ECT's when this happened so I can't be much help there, but I did puke about a gallon of coolant before I arrived at my finial destination.
I believe the worst thing for your HG/stock head bolts is making high boost numbers and them getting off the throttle very quickly. W/O having a wasetgate or blow off valve the boost pressure has to go somewhere and that is into the cylinder when RPM's are decreasing, making for a large spike in cylinder pressure.
With that said, my truck will have a BOV on it before I load the 310 again.