The turbo that I took out my 87 Quest has some numbers missing. It has 491_8-017_0. On the other side it shows _05-1__. The _'s are blanks. It looks to be OEM.
I would like to show the picture, but I have no web site upload program at this time. Could this be a manf. defect. Or a reman blank? I could e-mail the pic. if needed.