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Lower unit interchange- what years fit?

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  • Lower unit interchange- what years fit?

    First let me start by saying I'm new to iboats.com and really appreciate the site. Excellent source of information. Couldn't ask for much more.
    So here's my problem, I need to change out the lower unit on my 1980 Evinrude 70 hp. Model #E70ELCSA. It's a 20" shaft, driveshaft has 4 splines on top, 13 on the prop shaft. What years and hp range will fit this motor?
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