LS Electric Water Pump Adapter Plate. (Converts BBC to LS1 LSX Engine) 551515. 1234 ICT Billet Swap. These adapters are designed to use much cheaper Big Block Chevy electric water pumps on LS engines. There 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. Thank you for your understanding. Accepted within 14 days after receiving the item. Perishable or Hazardous Goods are not returnable.