Using new head bolts when performing a cylinder head installation is always a good idea however, on late-model engines that came from the factory with TTY (torque-to yield) head bolts, replacement is an absolute necessity. TTY bolts are designed to exert the maximum clamping force for a tight head gasket seal, however they permanently stretched and could fail if re-used.
OEM / Interchange Numbers: 6509564AA, HB33156
VICTOR REINZ Warranty Information:12 months/12,000 miles
