Proform Roller Rockers set (Chev S/B ) 1.5 X 3/8 #66907

Rocker Arm Mounting Style: Stud Self-Aligning: No Rocker Arm Ratio: 1.5 Maximum Spring Diameter (in):1.400 in. Rocker Arm Style: Full roller Stud Size: 3/8 in. Shims Included: No Rocker Arm Material: Aluminum Rocker Arm Body Style: Standard Rocker Arm Fasteners Included: Yes Rocker Arm Nut Style: Polylock Slot Width (in): 0.550 in. Rocker Arm Finish: Blue anodized Quantity: Sold as a set of 16. These Proform extruded aluminum roller rocker arms will help rid your engine of internal friction. They feature a race-proven, full needle-bearing fulcrum and roller tip. And they not only unleash horsepower, but they also lengthen valvetrain component life and reduce wear and tear on valve stem tips. These rockers are precision-machined to ensure consistency and ratio accuracy, and they have a great looking blue anodized finish.