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I was wondering what are the differences in the timing chain sets from before 1984 to after 1984? I somehow ended up ordering a set for pre-1984 for my 89 motor, but I am using an electric fuel pump. My best guess is that there is a difference in the top sprocket that deals with the spacing of the pump eccentric? As far as I know all of the small blocks use the same cam retainer plate?
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