Dart Pro1 200 small block chevy cylinder head. This head was used as a cnc chamber sample by Dart. The head started out as a 72cc chamber head, then Dart cnc'd one chamber and milled the head down so that one chamber would end up as 75cc's. I only have this one head so its good for someone on a budget who needs one. You will have to hand port the other 3 chambers on this head to equalize them. The intake and exhaust runners were untouched. This is a 200cc intake runner, 72-75cc chamber angle plug bare head. Also, this is the newer platinum series pro1.