I believe part of the procedure in the shop manual for head installation is a re-torque after the engine is warm. That is for a 216/235 but a 261 wouldn't be that different. WhenI did mine some of the bolts moved at lower values.

Last edited by truckernix; 10/18/2013 3:14 AM.
1951 GMC 1 Ton Flatbed -- It is finally on the road and what a great time I have driving it!
1951 1 Ton Completed

My Chevy Master 4 Door is on the Road!