Quote Originally Posted by newthings View Post
I am surprised the bolt did not come free with the load off.
The lesson is to run a tap down every hole and use Never Seize or other thread lube anti corrosion product on every bolt. You will not get a true torque reading without a thread lube. In critical applications, for the first pass in tightening I torque to about half load and back off twice and then turn to the target value.
Good luck.
Roy
I have " for the most part" stopped using head bolts for this reason and have moved most of my motors to head studs.. no broken bolts, a better and more even head torque, less failure or leakage from head gaskets, usally cheeper to get a set from ARP than factory head bolts. If you read the fine print , the factory does not recommend the reuse of head bolts, Very few do.
Just some food for thought.