I think he is thinking, if not ignore this, stretch bolts, they are basically torqued to the max & the bolt actually stretch's. A torque of 20" lbs then 90*(just an example) would be how they would have you torque the bolt. So if you read in the manual that it needs to be torque to specific torque & then an additional degree of turn that would be a stretch bolt. Head bolts on a lot of the newer vehicles are this style. When I got my primary gasket at the dealer they told me I needed new bolts also (I got the belt for a 2007), then I told him I had a 1999 Ultra he said never mind. So it is something they have done at least from 07. If they have o rings, that would make sense also.
Toby