SEI Marine Products

SEI has created a library of technical "How To" videos to help consumers perform the installations of some of our most popular marine parts. We will continue to add technical videos to our YouTube Channel yearly. Also feel free to visit our Tech Support Forum at the link below for more help.

Who is SEI? 

Sterndrive Engineering (SEI) is the largest supplier of aftermarket sterndrives and our own line of outboards in the world. The company makes replacement sterndrives for MerCruiser's® Alpha One® and Gen II stern drives and replacement outboard lower units for Mercury®, Johnson/Evinrude® and Yamaha®. Sterndrive Engineering's Outdrives are not remanufactured, they are entirely new. The SEI drives are made of parts that are completely compatible and interchangeable with the OEM. The drives are assembled at SEI's factory in Oldsmar, Florida.