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?