Custom Roush ported heads. These heads were made for a Daytona prototype program Roush was involved in and have had an extensive amount of work done to them. The were CNC ported and have custom CNC lightening done to the castings. They have copper beryllium seats, bronze guides, custom oversize intake valves, all the work has been done by Roush. Call or text for more info. Five40-735-879one. $5500