LS Electric Water Pump Adapter Plate (Converts BBC to LS1 LSX Engine) 551515 For Big Block Chevy Pumps 5/8 in. Thick -12 AN ORB Natural Aluminum Finish Includes: Bolts, Gaskets, and (2) Plates These adapters are designed to use much cheaper Big Block Chevy electric water pumps on LS enginesThere are -12AN ORB threaded fittings on the top of the adapter plates. These should be combined with a "Y" block then transfered to the radiator.