1995 7.3 head bolts
So I have a 95 7.3 im completely rebuilding, long story short im putting the heads back on with new gaskets and and felpro stock head bolts. Driver side torqued down nice to 105ft/lbs and go to do the driver side and only some are torquing fully to the 105ft/lbs. So thinking the bolts maybe stretching or defective in some way I got another new box and not to take the pressure off the head gasket l left the ones that did torque in. So start changing them out and the threads were still all good on the ones I took out. Put the new ones in and start to torque them and 2 of the 3 that I changed out torqued good but the third one would not hit torque spec and snapped in the head. Any reason you guys think why? Like I said the threads were fine and clean the bolts were lubed with fresh clean oil.