Edelbrock part #77791 Red Roller Rocker arms are designed for Big Block Chevy's using 7/16 studs. This 1.7:1 Ratio, single replacement rocker is manufactured in the USA from lightweight 7129 grade aluminum. The body is CNC machined then micro polished an 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 LocksSold Individually
