Re: Do I have the right pump?

[amuller]

From studying the books it does appear that 78-79 was the transition from the metal 3 screw impeller housing to the 4 screw plastic housing with SS liner.

Since my gear case has 4 screw holes and the isolator/spacer had to be cut to fit, I suspect the newer setup is the best one for this situation. Marine engine lists multiple housing and cup numbers, but shop.evinrude only one each. I am as cheap as can be, but with the housing costing $8 and the plate $3 and the cup $14, plus a few $ for gaskets, I incline to just buy the stuff, assuming the rest of the motor continues to check out.

Are there gear ratio differences to look out for?