Scorpion 3/8 in Stud Mount, 1.3 Ratio, Low lift break-in Full Roller, Aluminum, blue Anodized, Small Block Chevy, Set of 16. These are low lift rocker ratio for new flat tappet camshafts and lifters on break-in, these replace your standard rocker with low lift rockers, reduces the load on the cam and lifter on initial break-in. Please e-mail with questions.