Yamaha KT 100  Radial cylinder heads from my fathers estate  30 +  years young and brand new   The buy it now price is $ 300. delivered to you in the USA only  , If you only want one of them its $ 200. delivered to you , These were used and sold for the Quicksilver and other ultralight aircraft using the KT 100 SD Yamaha engine ,  they worked well and made them run a lot cooler , Thanks for looking