These head studs 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 1997-2003 LS engines and some 2004 LS engines using "unequal length" bolts.
****PRODUCT IS DROP SHIPPED DIRECTLY FROM THE MANUFACTURER****