Here is the head.
https://www.aftershockmotorsports.com/index.php?main_page=product_info&cPath=1_6&products_id=13I can check if we have any more radiator kits left. It is listed as out of stock, but I think I ran across some old stock.
Our setup does not need a pump. For it to work, you need:
radiator above head
radiator with vertical tubes
lowest point of head connected to lowest point of radiator
highest point of head connected to highest point of radiator
ideally, hose never dip in the middle or go above the ends
It is the same concept as convection, but called thermosyphon with liquid. It will flow faster than some may think and it will self regulate without a thermostat. The hotter it gets, the faster the water will flow.