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 Ratio
• Accommodates Up To 1.65 in. Diameter Springs
• 7129 Grade Aluminum W/ Red Anodized Finish
• Includes Thick-Walled Adjusting Nuts & 4140 Steel Poly Locks
• Set of 16