DESCRIPTION Water Pump Pulley --Material: High-quality aluminum --Surface Finish: Polished --Design: Single groove pulley --Outside diameter: 6 9/16" --Bolt circle: 2 1/8" --Center hole diameter: 5/8" Crankshaft Pulley --Material: High-quality aluminum --Surface Finish: Polished --Design: Double groove pulley --Outside diameter: 6 9/16" --Bolt circle: 2 3/4" --Center hole diameter: 1 1/8" --Applications: For Chevy Small Block 265, 283, 305, 327, 350, 383, and 400 1955-1986 --Package: Including all items in the picture. Note: Professional installation is highly recommended (No instruction included). Your package will be shipped from multiple warehouses.
