ARP High Performance Series Head Stud Kit - 5.7L/6.1L Hemi (SRT) It is for good reason that virtually every top professional engine builder relies on ARP Pro Series head studs for their all-out competition powerplants. Simply stated, there’s not a better stud setup on the market today. For openers, ARP uses a... MSRP: Was: Now: $453.42 Add to Cart