joegr
Dedicated LVC Member
Not sure if the LS is like this or not but a lot of newer cars use "Torque to yield" bolts. Once they have been torqued, they are stretched and not to be re-used. Kinda sucks, I had the heads off my '65 Mustang a dozen times and never had to get new bolts. Technology & progress!
Yes, the LS uses torque to yield bolts for the heads.