The biggest drawback of a /6 head is that it was designed for a 170 cu in engine . Even a stock 225 is choked down a lot . The stock bore is too small to flow enough air to make serious power . I understand why a potential manufacturer is shy about going forward with a project like that . Redesigning the whole head is in order . the Aussie 264 or the 4.0L Jeep have much more potential .
