Torque to yield, head bolts...

TTY bolts are used in many places in an engine now. I see them used in main caps, rods, heads, cams , intakes, etc.. We were using them back in the 2.2 and 2.5 heads back in the 80's. Some are replace every time, some can be reused if not necked down. When we were doing Neon heads all day long our dumpsters would be weighted down by head bolts.