I've talked to Kirby several times this summer, most recently in late July. He is in the process of machining (25) heads right now. They have been available for a long time, since the early 80's, its just the cost that turns people away from them, because the demand is relatively low compared to a SBC or more popular engines. If he could make several hundred at a time, that would bring the individual cost per head down considerably, but the (25) he is doing now probably represents only about what you will sell in about 4-5 years, unfortunately!
