01-16 Duramax Stock Head Bolt Large 12x121 mm

2001-2016 GM 6.6L Duramax Stock Head Bolt Large 12x121 mm

When changing the head gasket on a Duramax the stock head bolts are not able to be reused.  The bolts are a torque to yield design and should not be used twice.  These are the large bolts measuring 12mm x 121mm.  Thirty six are required per engine (18 per head).