ARP 134-3610 Pro Series High Performance Head Bolt Kit for 2005 and Newer LS Engine 

Be sure to note which head bolts you need as GM used two different style LS head bolts

 1997-2003 heads used QTY 8 155mm Bolts, QTY 2 100mm bolts, and QTY 5 45mm bolts

2005-2013 heads used QTY 10 100mm bolts, and QTY 5 45mm bolts

These head bolts are manufactured by ARP from premium 8740 chrome moly steel and heat treated to 200,000 psi. They are thread rolled after the heat treating process, which vastly improves their fatigue tolerance compared to studs threaded before heat treatment. High-quality, parallel ground washers and 12 point nuts included.  Exact tolerances ensure that gaskets and cylinder heads just glide into position and align perfectly. For all 2004 and newer LS engines,  

ARP Pro Series cylinder head studs are cold-forged to ensure molecular integrity. They're heat-treated prior to thread rolling and machining. ARP Pro Series kits are also available with 12-point nuts, and all kits come complete with hardened parallel washers for an even load distribution and accurate torque readings.