Edelbrock part #77771 Red Roller Rocker arms are designed for small block Chevy's using 3/8 studs. This 1.5:1 Ratio, single replacement rocker is manufactured in the USA from lightweight 7129 grade aluminum. The body is CNC machined then micro polished a Product Features:0.375, 1.5:1 RatioAccommodates Up To 1.65 in. Diameter Springs7129 Grade Aluminum W/ Red Anodized FinishIncludes Thick-Walled Adjusting Nuts & 4140 Steel Poly LocksSold Individually
