Hello to all. This makes me wonder how many people performed the change to the 12 pt nuts while the cylinder heads were still attatched to the cylinders, valve springs compressed trying to push the block apart. If done one at a time there should be no disturbance to the case halves but I cleaned and checked the heads and valves while performing the nut change. It is my understanding that the sealant between the case halves could be compromised allowing internal oil leakage, lower oil pressure if the cases split the slightest amount during the process. To me, possibly, it's not the 12 pt nut torque but the proceedure some may use to perform thier work that gets them in trouble. I am saying this generaly speaking, not towards anyone in this group!!