Specification: 100% brand new, Never been tried or installed Type: Water Pump Pulley Finish: Black Groove Quantity: 2 Pulley Material: Steel Overall Diameter: 6.3" 1.75" Bolt Circle. Pulley Style: V-Belt Water Pump Style: Short Water Pump (SWP) Steel water pump pulleys provide affordable style and reliability. Professional Installation is Highly Recommended Installation Instruction is NOT Included Fitment: Compatible with Big Block Chevy engines 396 427 454 1965-1968 .