[gork1rogues]

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?

 

[tonys10sec306]

i know the efi ones do not have a hole four fuel pump

 

[gork1rogues]

Yeah the timing cover doesn't have a hole starting a couple years after 86, but trying to find the difference in the chain sets.