I just want to point out the mis-information that is floating around regarding the 1/2" head late model SBC head bolts used in the later TBI, Vortec and LT1 engines as well as the GM crate engines. I keep seeing people posting claims they are torque to angle but are not torque to yeild. That information is FALSE. Always replace the head bolts if they have 1/2" heads. I compared a new set of GMPP head bolts as well as a once used set that came out of a Vortec 350 engine. Every last bolt had streteched about the same. I keep seeing this false information and hope this saves someone a real headache.
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