2001-2012 GM Duramax LB7 LLY LBZ LMM LML ARP Head Studs. 230-4201
ARP fasteners makes the best and stronger engine head studs on the market today.
Your 6.6L came from the factory with head bolts .
The factory head bolts were designed to stretch but over time the bolts stretch past the designed length and allow the gaskets to leak.
With ARP head studs there is no more stretch and there for no longer issues with blown head gaskets.
All ARP studs are heat treated and feature rolled threads 8740 alloy is rated better than aircraft quality.