Quote Originally Posted by 4D55 Performance View Post
This is the head that you want because they are a reputable company and they do not sell cheap chinese crap. Yes I have used them in the past and there heads are great. They are also compatible with the 1984-85 injectors. If you have a 1983 diesel then you will need to pickup new injectors as well.

http://www.ebay.com/itm/Mitsubishi-4...item256a6a7dd1
I also think i need to replace the head on my 83 ram 50 4d55 so im trying to get to the bottom of this. this item says flush type valves, though what im seeing most people say is that the older 4d55 had protruding valves.

what i dont understand is why this isn't interchangeable? the protruding type say the protrude a whole 1mm! i imagine it'd be fine to use this flush type head on my truck but i dont want to run into any problems!

does anyone know for sure what the interchangeability of these heads are?