As you can see its a dohc 16valve pentroof chamber, 8 port head for an aseries. Remarkably its all machined out of a solid alloy billet (not cast), thus having beautifully shaped polished ports, and 3 angle valve seats, using standard mini valves still. It has one off custom piper cams fitted, toped off by a custom cam cover. There is also a wonderfully machined inlet manifold to run twin su's, (head gasket is on face) and the start of a tubular exhaust manifold. It was made about 20 years ago, but has never been fitted.