( C/C-1004-16 ) - Small Block Chevy Aluminum Rocker Arms - 1.5 ratio for 7/16 INCH stud - red anodized, machined aluminum with needle bearing trunions which allow high valve spring loads of over 350lbs OPEN spring pressure. Our aluminum roller rockers are maid from a high-quailty alloy with a tensile strength of 80,000 PSI. set of 16