=stern drive question
 

what type of mercruiser stern drive do the 74/77 wellcraft inboards have with a straight six from chevy

R/MR also often called pre alpha

can you expand on the question IE what are you trying to do?

drives during those years are usually referred to by the horse power designation of the engine in front of it, in your case it would be a 165. Most of those drives are generally referred to as MC-1 drives, the MR(Mercruiser revised) drive was an early version of the Alpha 1, having the upper drive shaft bearing in the lower unit flipped over for better load control. The true Alpha one had a redesigned upper gear case to go with the internal changes of the lower. If you want to up grade an MC1 to an Alpha 1, you will need to keep the input shaft off of your drive

i was either gonna upgrade to a newer model or was just trying to get an idea to go through it and replace some parts boats has been sitting four years till i bought it

the best deal going is the sterndrive engineering drives(SEI.COM), you can replace just the lower at first, or the upper

an alpha (gen 1) will bolt right up... you should have a 1.98:1 ratio... a 1.47/1.5 will also work but will require a prop with less pitch and may cost ya 1 or 2 mph

theres a boat shop that is like a used parts wharehouse for parts ill try there the sei took me to a scrapbook site thatnks for the help

that's because the website for SEI is http://www.sterndrive.cc/

thanks for the correct link smoke, BTW, the straight 6 used a 1.65 ratio

no prob.... My 76 merc 165 hp 250 ci had a 1.98 It came in an 18' sea sprite tri hull. I put it in a Carver 2667 santacruz flybridge sportfish.... I guess they came with 1.65 also tho?


was an awesome engine.... did over 40 in the sea sprite and 25-29 in the 5500 lb (empty) carver depending on how heavy she was loaded up to 6 people 100 gal fuel and 60 gal water