(not mine)
https://www.ebay.com/itm/Yamaha-RD400-Daytona-Special-RD-400-RD400F-Cylinder-Head/323705627272 (https://www.ebay.com/itm/Yamaha-RD400-Daytona-Special-RD-400-RD400F-Cylinder-Head/323705627272)
Yamaha RD400F Daytona Special Cylinder Head
Already cut
Under $100 + shipping