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Ford FE 390 427 428 1.76 Ratio Aluminum Shaft Mount Roller Rocker Arm Set Brand: Procomp Electronics Part Number: PCE261.1058 Part Type: Rocker Arms Rocker Arm Mounting Style: Shaft Rocker Arm Ratio: 1.76Rocker Arm Style: Full roller Shaft Diameter (in): 0.840 in. Shims Included: No Self-Aligning: NoRocker Arm Body Style: Standard Rocker Arm Material: Aluminum Rocker Arm Finish: Gold anodized Quantity: Sold as a kit. Procomp Electronics extruded aluminum and stainless steel shaft mount rocker system includes steel shafts with pedestals. These rockers feature large bushed bearings and roller tips. For extreme high performance applications. 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 have a great looking anodized finish.