Up for Sale: Professionally Rebuilt Water Pump Applications: 1963-65 Chevrolet High Performance w/ 283ci and 327ci engines w/ High performance Aluminum intake manifold For High Performance engines that require a 1/2" NPT top outlet on the water pump Specifications: Aftermarket version of 3839175, or 3859326 w. 1/2" Top outlet Warranty: 6 Month The quality of our rebuilds will speak for themselves, these water pumps have been through a meticulous process to make sure they meet or exceed industry standards. New bearings and seals were used to restore this to OE standards. This is a professionally rebuilt water pump by our family business with over 50 years of rebuilding experience. If you have any questions regarding this item contact us by email.