It's a port & polished head on my 04 dazon 150. It takes the longer stem valves because of the angle of the valve chambers, it is a very strong running engine and I don't want to change to another 3" head unless I really have too! plus I'm pretty sure if I changed to the standard 2.5" head I would have to change the cam chain to shorten it and get rid of the extra slack it would cause.
