quick view Add to Cart Wide Open Perf WOP 6.6L Head Stud Kit fits 01+ 6.6L GM Duramax MSRP: $850.00 Depending on the trucks set-up, upgrading to a set of these A1 Technologies head studs is always recommended at boost levels above 38-40-psi. These are the best head studs available on the market today for the Duramax and the same studs we run in our... Add to Cart Add to Wish List Add to My Wish List Create New Wish List Compare