Edelbrock part #77790 Red Roller Rocker arms are designed for Big block Chevy's using 7/16 studs. This 1.7:1 Ratio, set of 16 rockers are manufactured in the USA from lightweight 7129 grade aluminum. The body is CNC machined then micro polished and anodiz Product Features:0.437, W 348/409, 1.7:1 RatioAccommodates Up To 1.65 in. Diameter Springs7129 Grade Aluminum W/ Red Anodized FinishIncludes Thick-Walled Adjusting Nuts & 4140 Steel Poly LocksSet of 16
