torque to yeild bolts usually have about 2-3 torqing sequences in them before they are stretched enough to be junk. Usually, if its the first time the head gaskets are done re-using the bolts is OK. There are a LOT of torque to yeild bolts in a modern engine. few are ever replaced.

for the record, any automaker i know of recommends replacing torque to yeild bolts when re-assebmled.

-matt

-'88 toy x-cab, SAS, chevys, gears, lockers, free tires, dented body mod.
-'87 4runner, bone stock DD

"It's OK to do stupid things, as long as you are not stupid about it."