Rebuilding this 12 valve, got new bolts from Cummins and several of them keep turning and won't come to final torque of 124. Started at 44, then 88, and a couple went to 124 but others keep turning. Does this mean they're stretching? The book says to go to 124 with no additional 90 degrees mentioned. The bolt heads have a T + 90 on them so what torque do I stop at? Have I damaged the ones that have kept turning? Probably 180 past something after 88 while looking for 124. Torque wrench is a Snapon that just came from calibration. It repeats good torques when I get them.