No downtime waiting on the machine shop to mill your old ones No hassle of dealing with cores Already sized to fit head stud kits whether it be Gator or ARP brand High quality precise machine work High strength metal Brand new, not made from old cores Nothing Bites Like Gator! These Modified Rocker Arm Pedestals are machined/milled for installation of Head Studs in the 5.9L 12V Cummins Engines. Rather than having your old stock pedestals machined to size, these are ready to drop right in and get back to building that motor.